The device is identical to the Hama Battery Tester BT2, costs comparatively but only about 40% of that. It can be easily all common sizes of batteries test (whether mono, Micro, Mignon, 9 volt block etc., and some button cells). The charging status is indicated on the LCD display in bar form, 0-5 = poor, weak and 6-10 = 11-18 = good. The display is well labeled and easy to read. For the most accurate results, the battery should remain quiet for a few seconds in the corresponding slot. In this way you can just for devices in the multiple batteries / accumulators are easy to find out which are still in order, and which are not. So do not have the same all the batteries to be replaced - but only the low-charge state. Am very happy with it so far
