I have been wanting a good battery tester for years, so I finally broke down and ordered this one. It is designed to test the most common batteries used in your electronics, radios, flashlights, etc. We have always used our digital multitester for checking batteries, but it is a pain to try and hold the battery and simultaneously touch probes to the poles of the battery. This device, on the other hand, allows you to install your battery to be tested and simply read the 18-bar LCD readout. This has the potential of saving $$$ by not disposing of perfectly good batteries just because they have been in use. They still may have more life left.