Decibel Meter,Mastfuyi Digital Sound Level Meter Portable Sound Meter 30–130 dB MAX Data Hold with LCD Display Backlight A/C Weighted for Home,Office,Factory,Noisy Neighbors,Green

I bought two different brand/models of sound meter. Since they can be found so cheap it was worth getting a second to compare results. In a room with a background reading of just under 40dB, using the slow update rate, both using the A weighting, this meter is typically within about 1 or 2dB of the other meter. After a few months of wondering about that difference I bought a SPL calibrator and using it both this and the other meter are within about 0.2dB of the calibrator rated output. So, this and my other SPL meter were shipped pre-calibrated. the difference I see between the two meters in-use probably comes down to then being independent with not synchronized timers so the average level they show at any instant depends on the sound environment seen by each meter and might also be affected if they are not in the same location pointing at the same sound source. I also tested using the calibrator in a room with background music playing at about 55dB. Both calibrator output levels are higher and the calibrator provides about 20dB shielding from outside noise. There was no difference in the measurements using the calibrator with or without 55dB of background music in the room. Based on the calibrator tests this and my other meter obviousy should not be used for laboratory testing but are very good point of use SPL meters. I also performed some basic tests using the following audio sources: Ambient sound level Music at a pleasant volume White noise a 10 second 30Hz to 8kHz sweep (covering the documented frequency response) The meter behaved well within documented specifications for me. Testing with a tone generator at 1kHz I also see deltas close enough to 3dB when halving or doubling the output amplitude. The sources aren't calibrated, an Android audio signal generator app via a bluetooth speaker that has dedicated filtering for music. However, since both this and my other meter have a stated accuracy of +/-1.5dB with 0.1dB resolution I'm comfortable with the A weighting mode on this device. In the C weighting mode the reading from the two meters differ typically by around 6dB using the same sources and peak difference is about 10dB. That is pretty severe (typically 4x linear difference and up to 10x linear difference between the two meters using C weighting). I wasn't using sources with high audio power, just the same ones as I tested the A weighting with. The test environment was probably the reason for the difference because I have no low frequency background noise which the C weighting would be more sensitive to. So, again, all appears well using C weighting. Without a calibrated signal source these observations are only illustrative speculation rather than verification of anything. The live level meter is really just a stepped scale with three levels, green, yellow and red shown on a horizontal bar with six segments for each color and the expected purposes for the colors. It would be nicer if each individual bar segment was used individually to implement a live meter view. Above 50dB a rather annoying set of 3 yellow/greed LEDs is lit on the left of the LCD display, it makes sense if the level is persistently above 50dB for hours according to government data but probably not significant in a case like music that just exceeds 50dB repeatedly and flashes the LEDs. Above 90dB a set of 4 red LEDs lights on the opposite side of the LCD display. In both cases the LEDs are quite distracting from the meter reading. Annoying as they are when handheld these LEDs would be quite useful if the meter was placed on a static location in a possibly noisy environment and powered on. The 50dB and 90dB levels being exceeded would be visible without having to return to the meter. The fast update mode is 8 times per-second for the displayed dB level on the LCD and is probably great for adjusting a source of a stable signal but I have to say I prefer the slow mode with an update per-second due to the less volatile and eassier to read meter number. This is a place where a true bar meter updating 8 times per-scond while the dB level number updating every second would be quite useful. As far as I can tell it can only show the maximum sound levels, my other meter has a min and max view which is a nicer perspective (dynamic range). Both have a button to hold the currently displayed level which can be helpful trying to judge the effective level at some point when using the high speed update rate. It comes with what seems to me like a nice microphone pop filter that seems to me to be better than the one supplied with the other sound meter I bought. It has a belt clip and the battery cover has a screw to secure it. It's does quite a good job of filtering out user handling noise. But is easily distracted by simple sounds like moving things near it. It's a shame there is no cover for the microphone other than the pop filter, when unused for long periods the pop filter will take any bumps. Having seen the results with the calibrator I'm happy using it to as a servicable SPL meter.

This is a great value at $12, kind of rollback pricing to a decade ago. It's accurate compared to my more expensive models. I bought this and use it on my secondary stereo rig to test headphone and speaker volume to pretect hearing. The dBA setting, which focuses on sounds that can harm your hearing, is super useful. The lights give you a hard-to-miss alert when the sound gets to loud. Some gotchas: The curved graph is really just for show. As far as I can tell, it doesn't light "some" of the bars in a particular color - it's all or none of the yellow, all or none of the red. If you have to have that feature work as expected, look for the DURFICST brand's affordable model(s).

Works awesome and love it.

The C mode (the reason I purchased) doesn't work at all. Just sits at overload. Total junk not even worth the shipping price to return.

Funciona como descrito na descrição deste produto.

Works well!

Gostei muitooo

Parfait correspond parfaitement à la description fonctionne très bien Idéal pour des mesures simples et rapide

Funziona ma tanto plasticoso