I have had the Ejoyous sound meter for a few weeks now and so far it's been working fine. It remembers the min and max values when you're using it so you can tell where your peaks are even if you miss it in real time. It seems very accurate to me, there are some attached pictures showing this meter along with my iPhone running an app, which I am sure is less accurate than a dedicated meter.

The LED readout is large and has a backlight if you're in a dark room (or if you want to see how loud the crickets are in your yard at night). The batteries seem to last a long time and the box it ships in small but has form fitted plastic inside that makes an ideal storage and transport case. If you need to know how loud it is and want a tool under $20, this is for you.

First time used a sound meter, very interesting,I like it.

it is a great solution to measure the sound level but sometime for the same sound it give me different level , maybe is my sound that is too strange

Picks up sound but jumps all over the place. No solid readings. Up and down fast. Doesn't stay.

Works very well to get an ambient measure of sound in a room, super easy to use device that gives fairly accurate sound levels, anytime, anywhere.The price is well worth.