It does its job just fine. Before sending the batteries for recycling, it is good to check them.

It is a decent product for the money it costs, but it has a fairly cheap construction. It does not secure the battery in place, so many times they do not make contact and appear empty. Also, the indications for where the positive and negative poles of the battery go are not clear enough. It ultimately gets the job done, but I would recommend looking into another solution.

It's great! Easy to use and reliable (as much as such a product can be). It's worth its money!

Average build quality.. Does its job just fine.. Doesn't need an extra battery.. Works with the one it comes with.. If it's empty, it doesn't show any indication.. I don't think it will ever break, unless you step on it or throw it down with force..

With the same battery, one lights up and one does not light up - cheap construction that gives you the feeling of even more unreliability. I do not recommend it!

A very important tool that will help you a lot. You will be able to see the condition of your batteries. Very user-friendly.

It does what it promises with "relative" accuracy in voltage measurement. The build quality is not that good. For its price, it is very good

Very convenient, easy to use, and reliable. Easily and quickly know when a battery is usable or for recycling.

Nice, it doesn't need its own battery to work, as it only requires power from the batteries it measures.
Update: After about a year, the screen seems to have short-circuited, so you can barely read what it says.

The indications are in volts and on the back you can read from how many volts and below the battery needs to be changed that you measure.... It seems serious

It's a joke!! I measured approximately 12 batteries one by one and I was disappointed!! The same battery, at the same time, in 3 measurements....3 different readings with a huge difference!! Choose! The readings compared to a professional multimeter...day and night!!! I threw it away, 3 euros wasted!!

Very useful little device, everything is good. It saved me a lot of time from having to take out the multimeter every now and then.

Economical, reliable, fast. Its economical price is reflected in the cheap construction materials. However, it does its job exceptionally well.

Very good meter. Its big advantage is that it operates with the power of the tested batteries.

For its price, it is very good. However, as other buyers have noted, the battery compartment is inconvenient to use since there is no suitable case to secure them, making it difficult for some of them to stabilize for measurement. For something basic, it is fine.

Cheap and useful for emptying the full ones when you have a bunch of batteries at home.

Simple and functional! Sometimes it takes a while to give a signal because the ends of the accumulators do not make good contact, but it's a minor issue! For someone who doesn't have specialized requirements, it's fine.

It does what it promises with "relative" accuracy in measuring voltage (the tested battery was also measured with a multimeter). The build quality is not so good, but its price is so low that it justifies it. The battery compartment is a bit inconvenient as it does not have a holder to secure them. Among its positives are the many different sizes of batteries supported. Overall, it is recommended for simple battery checks, as the quality-price ratio is very good.

It does its job and it also has a plastic engraved chart, which means it won't fade over time!! Perfect!! It couldn't be any cheaper though!!

Very good but not for all battery types (small in size like for example for hearing aids)

Good for its price and the fact that it doesn't need a battery to operate, I consider it an advantage compared to others. I have not checked its accuracy though.

Very good, it does its job perfectly fine.
Quality-wise, it's nothing special, very Chinese. I had one and it broke after 3-4 years, but I immediately bought another one because it's incredibly useful, especially if you have a child who plays with electronics and uses 25456434 batteries, so you can see which ones are for disposal or for charging

Good tool for very simple use and only for indicating the order of magnitude of the voltage. If it had a reset spring, it would be more convenient. In mine, one of the 7 segment displays does not work. Definitely not high quality, but it replaces the multimeter for initial estimation.

Quite good for its price, not cheap but not with very high accuracy measurement, but it gives you an idea if a battery is at its last or not. Watch presentation video: https://www.youtube.com/watch?v=dl8cE0Y1I-Y

It takes a little effort to put the battery in the right position for the measurement to be made, but for the price, it is excellent.

Very good tool and useful for checking batteries as it tests many types of batteries. Due to several children's toys with many batteries, I needed it to determine which ones are really for recycling and which ones are not.

It has very good accuracy and I have tested it on many batteries. For rechargeable AAA or AA batteries, the displayed value when they are full is lower than alkaline batteries, which is normal. It measures almost all types of batteries as shown in this video: https://www.youtube.com/watch?v=Haxl27viI08

The battery tester is great. I had countless batteries that I didn't know if they were good or not, and it helped me distinguish them.