Extech Instruments 407730 Digital Sound Level Mete


Monitor workplace machinery

Reduce workplace noise at the source by screening machines and taking action to avoid noise-induced hearing loss in workers.

Instal audio or alarm systems

By monitoring noise levels during the installation of audio or alarm systems, future users will be protected from excessive noise.



Dimensions: 22.86 x 4.32 x 5.59 cm; 240 Grams
Model: 407730
Batteries Included: 4 AAA batteries required. (included)
Manufacture: FLIR Systems, Inc.

76 Responses

  1. Anonymous says:

     United Kingdom

    OK its chinese, it will never be a Rhode and Schwarz but for a quick test to see that the dBa of the alarms is in the right ball park, it does it quite well. Nicely built. Could do with a protective case with it and for the money, even a slip cover would be good. Fortunately I had the box my previous meter came in that was replaced with this one after it died. Overall a reasonable tool

  2. Anonymous says:

     United Kingdom

    Has made my movie listening far better after using this to dial in my 5.1.4 Atmos setup

  3. Sean says:

     Canada

    I purchased this meter because it has both an “A” and “C” weighting response ( I needed the C weighting}.

    The meter works well and the display is easy to read.

  4. Anonymous says:

     United States

    Easy to use, instructions clearly written, good quality device, sturdy, well made

  5. Anonymous says:

     United States

    The right feature set for measuring machine noise levels at a reasonable price.

  6. Troy Media says:

     Canada

    Golden Review Award: 2 From Our UsersWork as advertised, gives precise reading.
    I used it to determine which tool was dangerously too loud.
    I used it also for the church music sound level to keep sound under the danger point.
    Works well.

  7. Anonymous says:

     United States

    Bought this because of a noisy neighbor above my apartment. Local police department uses it so I bought to be able to obtain same readings they would get if (when) I have to make a noise complaint.

    It would be nice if it had a wifi ability so it could obtain its own date/time stamp to create a noise record. Right now, I have to hold my smartphone beside it to show date/time when I start measuring. Not a big deal, but a nice to have. I have to make the video anyway, so I live.

  8. Anonymous says:

     United States

    Does what i need it to do and performs as the manufacturer claims. Quality seems as decent as any other similar gadget.

  9. Cassandra Szklarski says:

     Mexico

    Es una gran herramienta de medicin; exacto, verstil y robusto. No te quiebres la cabeza buscando cual es la mejor opcin, sta es tu mejor opcin.

  10. lindabol915 says:

     United States

    Excellent Sound Meter. This meter measures sounds of 40-130 decibels. Works very well. It comes with a foam ball which is added on the top of the mic for better sound absorption. It has to methods of measuring decibels A weighting and C Weighting. C is for sounds generated by machinery.

  11. Steve Milloy says:

     United States

    I have an older DB meter that does straight readings. I was looking for something that I could use for averaging and finding peak volumes so I gave this a try. It’s not at all expensive, is easy to use, and seems to work correctly. I have a high end calibrated source for my older meter, and when I tried it on the Extech it read exactly the correct value. So in a static situation the meter is very accurate. While I don’t have any way to test it for peak or average readings, I’m guessing that it’s probably pretty darn close. I plan on using this for measuring shop machine noise levels, and also for monitoring sound levels for the PA for a jazz band I play in. If you need a DB meter, this one will do a good job at a great price.

  12. Alina Bradford says:

     United States

    I am well pleased of the quality of this product and the difference it makes in our worship center.

  13. Anonymous says:

     United States

    A / V installer now makes my home theater installs sound amazing

  14. Anonymous says:

     United States

    It’s a good device, just the case it’s a problem. We need more protection. If you want protect your equipment it’s necessary to buy it in other shop and make one special for the device.

  15. Anonymous says:

     United States

    Did what we needed to do with this. Worked out great. The CEO of our company needed confirmation of what would be the best alternative for soy prodding his office. This helped us determine the best scenario. All went well.

  16. VirgiliKinchen says:

     United States

    Nice meter with great features for the price range. Typical Extech quality and function.

  17. Anonymous says:

     United States

    This is a very good decibel meter. As a mobile disc jockey, this comes in quite handy to make sure that music is playing at an appropriate sound level for the audience.

  18. Essie3563gnpyxm says:

     United States

    Works well for the price-point. Does not have the features of higher cost meters, but for checking on noise complaints it is a good buy.

  19. Anonymous says:

     Canada

    Ordered 3 units as a basic test tools, all work well and I’ve had no issues.

  20. Anonymous says:

     United States

    Awesome product. Kept our company, dB down (db-down.com) out of the dog house at the NAMM show.

  21. AugustusLinsley says:

     United States

    For the price this meter works as expected. It would have been nice if a fitted case was included, even if only genuine plastic, this meter does take care of basic noise metering .

  22. WandaCulver says:

     United States

    easy to use. not sure if not having a calibration device is going to serious impact accuracy

  23. Anonymous says:

     United States

    Golden Review Award: 42 From Our UsersI picked up one of these to help level match my subwoofer to my main stereo system. It has A and C weighting, and I used C as recommended. It worked great for this without needing to understand anything, right out of the box. I also used it to see if the level on the noise machine in my nursery was in the safe range, and adjusted it a little. There’s a lot of buttons I probably won’t use, honestly, but this is well made. It comes with a wind foam shield which you can use for outside applications. For quick estimates of sound volume (for unofficial purposes, I’m not sure how well calibrated this is) or for comparing two sources to see if they are the same, this is the right tool.

    I also used this to point out to my wife that the home theater stereo wasn’t too loud to do hearing damage. I then pointed out that her yelling at me at how loud the stereo was actually WAS loud enough to do hearing damage (90db!) and that she should probably volume down. Yeah, that didn’t go over so well. I don’t recommend using this for spouse volume testing. But for stereo equipment matching, oh yeah, it rocks for that.

  24. Leandra4041 says:

     United States

    Auto mode not much use unless just measuring constant background noise. Manual modes OK.

  25. Anonymous says:

     United States

    It works very well and showed results that I didn’t think that the situation would remain the same.

  26. Dr. Erik Steele says:

     United States

    Golden Review Award: 2 From Our UsersTested well when put on my calibrator. I have used it mainly for industrial use and the accuracy and certification are sufficient for my porposes. Has maintained the calibration over the last few weeks without noticeable significant errors.

  27. WinstonPKF says:

     United States

    Golden Review Award: 7 From Our UsersI purchased both the Extech 407732 and the Reed St-805. The Prime price currently has the Reed cheaper by $30. Except for the color of the case they are the same instrument. Same button layout, same functions. Everything the same but the color in the plastic case. I also purchased the sound calibrator from Reed. It was significantly cheaper.

  28. Anonymous says:

     United States

    Excellent unit. Well made, easy to use. Only minor dislike is auto off. I buy the batteries, I decide when it goes off.

  29. Anonymous says:

     United States

    Verry good instrument for the price. Not apprpraiate instrument for longterm sound studies. Would reccomend for simple sound testing. Good buy.

  30. Anonymous says:

     Canada

    Golden Review Award: 3 From Our UsersThe Extech 407730 is an excellent Digital Sound Level Meter for the price.
    I installed a new set of column speakers (JBL CBT100LA) in a new church and used the
    SPL meter to check sound levels in the room before and after the installation.
    The meter was very sensitive and quite responsive. The combined digital
    and analogue meter readout is a great feature. Few low priced SPL meters
    have this feature. No problems with the meter so far.
    Thanks!
    EW Edmonton, AB Canada

  31. Ashley Macha says:

     United States

    Golden Review Award: 2 From Our UsersFor a design project, I needed to measure some sound levels to make sure a device is UL compliant. This meter was set up next to a $5K reference meter and the readings were within a few dB most of the time. Pretty impressive for an inexpensive meter.

  32. Anonymous says:

     United States

    The first one arrived missing a table in the battery compartment and didn’t work. I exchanged it with no effort and the new unit works as expected. Handy lil guy and smaller than I expected (9″‘s long). I wish it had a case or pouch but I’ll toss it in an old mic pouch and in the gig bag. It has an auto off feature which should keep me from running the batteries out by mistake. Very happy with it for the cost.

  33. maleenhancementpillsi64 says:

     United States

    The device works great. Two things that it does not have are a backlight for dark environments (concerts, shows, etc.), and it also has a very pesky auto-off function so the battery does not drain. If this device did not have these, it would be perfect in my opinion. Still works great though!

  34. Anonymous says:

     United States

    Accurate, straight forward operation. Simple to use and easily read meter for sound levels. Great for testing occupational sound levels and machinery near personnel.

  35. Christopher Maynard says:

     United States

    Extechs decibel digital sound meter is simple to use. The digital read out is large enough to see easily, fits comfortably in one hand and the keys are easy to reach with my thumb. Leaving my other hand free.

  36. FelicitasCortez says:

     United States

    I bought the meter to check the noise of Pickleball and traffic in the community where I live. It works fine and I was able to measure all the sound in and around the courts.

  37. Darryl86Tgq says:

     United States

    So far this meter seems to be working alright enough. We have used this on numerous occasions: checking noise level of a window air conditioner to determine if there was any way to dampen the noise level via adding various barriers around window; checking noise level of mowers, tractor, and weed eaters – though we always wear some sort of protective ear gear (plugs or muffs). By measuring equipment we use /have on hand, this gives us a more realistic idea as to what level of noise reduction we want to target / pay for with future replacement or other “noise producing” equipment. I could use this in my business, as I believe the quality is sufficient for the purposes of a very “limited” sound survey.

  38. WilfredMize says:

     United States

    One of my 2 favorite simple tools. This and a stopwatch can really shutdown some complaints before they get very far.
    1. It’s noisier than any of the other ones, and 2. It’s taking longer than before… ah, science to the rescue.

  39. Jon Linkov says:

     United States

    Golden Review Award: 2 From Our UsersReally good. But a little expensive, My phone does the same exact thing with an app for free, I just bought this just to say that i had a “certified” item.

  40. Dante7596hpk says:

     United States

    Golden Review Award: 4 From Our UsersA very good and not too expensive sound level measuring device. It has a professional rating and is therefore viable for submission to government agencies overseeing community sound violations. I recommend buying it if needed.

  41. Anonymous says:

     United States

    After buying a cheap SL meter, I was looking for a better model that offered the ability to do Slow response and able to be calibrated. This one fit the bill and works great.

  42. Anonymous says:

     United States

    Golden Review Award: 2 From Our UsersI purchased this as a gift for an engineer, knowing how much he likes data. He LOVES it.
    If you purchase it new in packaging, it comes with batteries, which was a nice bonus, and the windscreen does help when you’re in an area with gusting a/c or things moving. He did say that it might read just a tiny bit high, but not so much that you can’t get accurate readings. He’s been playing with it all week testing everything from car highway noise to heavy duty machinery at work and has found that it reads quickly, accurately and the memory function is quite useful. It’s a “nice blend of not too sensitive and sensitive enough to work well”.
    I would highly recommend the meter, considering how much fun he’s had with it. Great buy!

  43. Anonymous says:

     United States

    Golden Review Award: 2 From Our UsersThe Extech 407730 is a good value for the person or company who needs an inexpensive way to read noise levels in any given environment. We operate lumber handling/processing machinery in a large semi-open area and needed a way to read noise levels in order to set boundaries for hearing protection zones and this product has provided us the information we needed.

  44. Anonymous says:

     United States

    Golden Review Award: 2 From Our UsersThe delivery was very quick. It is very easy to use and works perfectly. I bought it so we had evidence against a problem neighbor; the town is now prosecuting!

  45. Anonymous says:

     United States

    Not as user friendly as I had hoped and the on/off power button does not turn the power off instantaneously.

  46. LionelO12pjck says:

     United States

    I use this device to measure sound pressure generated by my PA sound systems. This device can also be used to verify that you are staying within legal limits regarding noise abatement laws. If you do a lot of sound work, you should get one. They are very easy to use, and can ‘remember’ maximum readings if necessary. Definitely Five Stars!

  47. maleenhancementpillsi64 says:

     United States

    This product works well and they shipped it to me on time. I have no problems with it. I like it.

  48. Laura Beckett says:

     United States

    Golden Review Award: 2 From Our UsersI am the safety manager in a plant; I bought this to get an idea if our noise levels warranted a hearing conservation program. It is only good for an initial screening; for a more definitive answer, you need a personal noise dosimeter. However, for a very reasonable price it gives you some initial screening data. It seems like a pretty good unit, especially for the money.

  49. Anonymous says:

     United States

    ool works excellent-exactly as described,we use it at a dealership-quality is good and is easy to use for all techs

  50. Anonymous says:

     United States

    Golden Review Award: 2 From Our UsersWe had some air conditioners that people were complaining that it was hurting their ears with him running yet you could have a conversation in right next to them so this digital sound level meter settled the problem is a good investme

  51. Anonymous says:

     United States

    Amatr iler ve hobi iin gayet yeterli bir cihaz. Fikir vermek iin kullanlabilir. fiyat / fayda orano bence olduka yksek. Tavsiye ederim

  52. FelixAshburn says:

     United States

    Golden Review Award: 30 From Our UsersSeemingly quite good. I won’t address audiophile applications because I am not using the tool in that way. I wanted a device that would monitor sound levels in my neighborhood and on construction sites that I drive to so that I wouldn’t have to rely on the assertions of others about actual and prospective noise impacts. This device is quite well suited for that. The MAX function allows you to catch peak impact noises, isolating them from the basic noise levels of the test area.

    This device was designed as a temporary or moment-to-moment metering device. Individuals who have the need to trap data and transfer a stream to a computer record should look for a different type of tool or a device with a larger set of metering abilities.

    The company delivers the device in calibrated condition, of course, but is inconsistent in its recommendation for calibration through time. In the accompanying user guide, recalibration is recommended before every use, especially if the instrument has not been used for some time. On the company’s web site, recalibration is recommended once a year. Recalibration requires an additional device; Extech offers one that costs twice as much as the meter itself. Independent professionals or employees of sound analysis services won’t be bothered by the expense, but casual users of the device may find that to be a large pill to swallow to keep a tool tuned up that is used only now and then.

    I metered a television broadcast whose volume was set in the overlap zone for the device’s high and low ranges and found the readings to be pretty much in agreement — perhaps 1-2 dB apart. This was a rough eyeball comparison, not a serious attempt to determine the meter’s consistency. My verdict is that the unit is easily good enough for occasional private party use and even quick professional determinations to guide expectations in a context where more extensive noise level studies are planned.

  53. Anonymous says:

     United States

    I need the meter for reference purposes. The meter is of good quality and works well. I have no way of knowing if it is perfectly accurate, but I don’t need it to be perfect. I have it on a tripod for testing motorcycle exhaust noise. It works very well for what I use it for.

  54. Rafia Shaikh says:

     United States

    As a camp director I was faced with people complaining that the band was too loud. I used this meter to prove to them that the band was within a safe volume range. They stopped complaining that it was too loud. If the band had been too loud (according to the meter), I would have asked them to turn their volume down.

  55. pmccartney says:

     United States

    It works well in a crowd of 100 for the sound system. It is serving its purpose just fine. Fast Shipping. Thank You

  56. Anonymous says:

     United States

    Golden Review Award: 2 From Our UsersSo I jam in a 6 piece band and our practices are always way too loud. I got this to show everyone that we’re seriously damaging our hearing. After getting this bad-boy, I scientifically proved that we were way too loud. Now when we sound check we can tone it down a bit to where we can play without ruining the future of our hearing.

  57. Anonymous says:

     United States

    This product works as expected. If you have a loud talker in your office this works great to let them know.

  58. Anonymous says:

     United States

    Seems like a quality product. Works for the purpose I wanted it for. Would recommend it to others looking for next step up from the $25 versions.

  59. Anonymous says:

     United States

    We recommend the Digital Sound Level Meter. It worked great for us. It measured the noise level we wanted to test.

  60. Anonymous says:

     United States

    Needed an economical, easy-to-use sound meter for my purposes. This one fits the bill very well. Simple, but sensitive – love the ability to measure over time and it remembers the high and low values

  61. Anonymous says:

     United States

    Golden Review Award: 2 From Our UsersGot this to ‘see’ the level of the sound intensity around me from various home products
    as I have diminished hearing from military duty and Vietnam.
    Sort of like getting ‘bundled’ software you didn’t request on a computer. There
    are buttons and features that just make the operation a bit more difficult but one
    doesn’t have to use them.

  62. ManieBlackburn says:

     United States

    Considring the price this instrument measured up nicely against others costing nearly 10 times the amount. Was certainly adequate for what are using it for.

  63. Stewart Wolpin says:

     United States

    Golden Review Award: 4 From Our UsersI did some testing with the product to see how repeatable it is and found the manual range setting to be more repeatable (and probably more accurate) than the auto ranging. I’m measuring some equipment that has a short duration noise spike, which is typically hard to measure. In the fast mode and with manual ranging, it does a good job with this and gives a repeatable reading.I don’t have anything to calibrate it with, so I can’t comment on accuracy, but it appears to read about what I expect it to. The owners manual is adequate, but the user interface is not intuitive, so keep the manual with the tool, as you will need it again if you have not used the tool in a few months. The memory hold feature works as stated and is easy to use. Quality is good, about what you would expect at this price.

  64. ErnestP39kvqsb says:

     United States

    This a nice sound level for the price. I have been happy with it so far. I have used it on and off for the past few months. It is easy to use and read. It is a nice basic sound meter!

  65. Anonymous says:

     United States

    Does what it says. Feels solid in your hand. Works very well. Good range of sensitivity. Easy to use. Good features.

  66. ExtraTV.com Staff says:

     United States

    It works exactly as expected, but it is a bit bulkier than is probably necessary. It would be nice if there were a directional feature that could be toggled, so you could get a noise level from a particular source or direction.

  67. ChristiCilley says:

     United States

    Easy to set up, works well. Was shipped promtly. Unit can be calibrated by Mfr if you need an official reading.

  68. Ken Korman says:

     United States

    Golden Review Award: 2 From Our UsersThe meter is easy to use and has a clear display, but it is so sensitive that even when a sound seems pretty consistent to a human ear, the readings go up and down dramatically.

  69. Juan Garzon says:

     United States

    Golden Review Award: 8 From Our UsersI lost some of my hearing in the military, and my father did before me. Hearing loss is progressive, painless, and permanent. I got this device so I could compare the sound levels in my gym to what is reported to be safe, so I can protect what is left of my hearing. This device did fine for this. I learned that 85 decibels is the loudest sounds you should be exposed to, and that this is louder than what I find pleasant even with my favorite songs jamming. But I’d recommend more people get this. What is your hearing worth? Lose it and you’ll find out. This device is cheap by comparison.

  70. Anonymous says:

     United States

    Golden Review Award: 8 From Our UsersI needed a high quality sound meter so as to verify or challenge sound findings in a project report. I was almost sure the data in the report was erroneous, however since I knew that my ears would not be considered as accurate sound instruments, I bought this meter. I found it very easy to use, and it more than verified that the information in the report was vastly inaccurate. Numerous other people have also used it and I have not heard any complaints about it. For me it was a very good investment.

  71. Anonymous says:

     United States

    Golden Review Award: 10 From Our UsersI have a car with very loud exhaust and I was worried about state inspection rules and the SCCA auto cross rules for loud exhaust. This Db meter is very easy to use and I especially like the max hold button so I can drive the car for a while then check the max Db reading. Very good meter, reasonable price. Good addition to my tool box. late

  72. Anonymous says:

     United States

    Golden Review Award: 39 From Our UsersI recently entered a contest sponsored by Lockheed Martin called Silent Stamina where the objective was to design and build a model airplane that would fly the longest time and not produce more than 60 db at full throttle.

    This was the cheapest sound level meter I found with an accuracy of +/- 2%.
    My meter read about 1.5db to 2db below the contest directors meter, close enough.

  73. Anonymous says:

     United States

    Golden Review Award: 133 From Our UsersThis Extech 407730 decibel sound meter is easy to use right out of the box and it works very well. The instructions are simple and easy to understand and everything worked as expected. I had never owned or used a sound meter before, so I wasn’t sure what to expect, and someone told me it can be complicated, but it’s “So simple a child could do it”, to quote Dr. Leonard “Bones” McCoy from the original Star Trek (Spock’s Brain episode)!

    Having both the “A” and “C” ratings available to use is a good thing — make sure you know which one you should use for your particular application (I did some basic web research to learn more). It measures 40 dB to 130 dB, and I was surprised to find that 43 dB is about my basic background noise in my yard, no wind but birds chirping.

    Also, the “Max Hold” function is great; it keeps the highest rating on the display so if you mount the meter remotely, you can still see what it recorded.

    I mounted it on a basic camera tripod and it worked fine. It actually has a metal tripod mounting thread, unlike some (expensive) digital cameras that use plastic.

    The only nits I can pick are: 1) The little foam wind sock that sticks over the end is pretty flimsy and it comes off too easily, but not a biggie; and 2) The battery cover is attached with a tiny Phillips head screw, rather than having a cover that simply snaps on. So you’ll need to find a very small #3 Phillips head screwdriver just to remove the batteries, and let’s hope you don’t have to do this at night or in the bush.

    It seems well made for what it is — basic plastic case and slightly mushy rubberized push buttons. The display is easy to read (not sure if it has a light, I only used it during the day).

    Once you familiarize yourself with the instructions, you pretty much don’t have to bother with them again, it’s that easy to use. The batteries are the el cheapo type that probably have about 25% of the lifespan of a good pair, but otherwise, this is a very nice unit that’s probably way overkill for just recording the neighbor’s late night parties. I used it for a basic scientific research project and published the results and it worked fine for that.

  74. Anonymous says:

     United States

    Golden Review Award: 11 From Our UsersI use this db meter in a professional recording studio for spot-checking SPL around the control room throughout the day and work week. It’s tremendously easy to use and anyone can quickly find their way around it’s buttons.

  75. MattieWinkler says:

     United States

    Golden Review Award: 17 From Our UsersAlthough I can’t test the accuracy it seems to work perfectly. Easy to operate. Large easy to read display. Fit’s the bill perfectly! Highly recommended.

  76. Anonymous says:

     United States

    Golden Review Award: 30 From Our UsersHave fun with this easy-to-use gadget:
    Measure the decibel level of your dog’s bark so that when your neighbors complain–you can say authoritatively: I am sorry and will try to remedy the situation but I measure only 60 decibels at your front door.
    Measure the decibel level of your stereo and see how many hours a day you can listen to it without having to save up for a hearing aid. (I don’t think you can measure headphone output with it).
    Measure the sound level when your uncle Frank passes wind so you can congratulate him on his new record.