UMLIFE 4PACK Battery Tester, Universal Battery Checker Small Battery Testers for AAA AA C D 9V 1.5V Button Cell Household Batteries （Model：BT-168 PRO）

These are very useful and work as advertised. It is so much easier to test batteries with them rather than a test meter, as others have stated. I highly recommend them.

Updated: I ordered these because I got tired of digging out a multimeter when I wanted to know the actual voltage remaining in an old battery. I originally reported that the battery tester stopped displaying at voltages below 1.2v. That bothered me though so I decided to retest to see if I received defective battery testers. It turns out that the problem was not with the battery testers but with a new multimeter that I used during the test. I got replacement batteries for an old, proven Radio Shack multimeter and used it for the retest. It showed that my AA test batteries only had 0.3v remaining; they were dead batteries. My new multimeter incorrectly reported the voltage as 1.2v. Based on this, the blank screen is the correct behavior for the battery tester because they powered by the voltage of the battery being tested. As verification, I also tested the old button batteries from the RS multimeter. Both the battery tester and the RS multimeter both reported an appropriate 1.1v while my new multimeter provided a more creative voltage reading. Apparently my new multimeter is not very accurate at low voltages. In the end though, my rating remains the same. If you want to see the remaining voltage of a battery, these battery testers are accurate enough and quicker to use than finding and using a multimeter. Most of the time though, you just want to know if a battery is still good and usable. That check can be made quicker and easier with the version of this tester that has an analog dial display.

2 for the price of 1! Used to pull out and fumble around with my multi meter to check simple alkaline AA and AAA batteries. But no more with these easy to use testers, pop them in and BAM there's your voltage read out with a DIGITAL GAUGE! Don't make the mistake and get ones with a meter showing bad/poor/good. Get THIS ONE that gives you a real voltage on the LCD. So much better to know if you can still use a battery or not. All in all the best deal on the planet with these!

Works well, nice to have digital readings for more accurate idea of battery level. Nice to have one for tool box and one for battery box

This is what came with the Battery Buddy storage container 2 years ago and I liked it. so naturally it was taken away from me and had to replace it. Glad Amazon had it at the right price. The digital version is so much easier to read quickly and gives a more precise reading very fast. Hope for more durability than the first one I had that lasted over 2 years. Please keep these available, would be cool to have one to check automotive batteries without a couple of cables hanging off of it.

All units work as described but I find them a little difficult to use. The sliding unit should be spring loaded. It does take one hand to operate the unit and the other to hold the battery in place to make proper contact with the tester.

Have to say that this is probably the best battery tester I have had ever used. Tired of using the multi meter for testing batteries. Not industrial quality, but it works.

Tells voltage remaining. Not what expected.