Overall nice battery tester. This tester displays the 'Internal Resistance' value, which is helpful to determine the quality of the battery and how well it will perform. It's capable of testing many different batteries(sizes, volts, chemistry types). I was able to quickly check my collection of 18650, 14500, AA, AAA batteries.I would have giving 5 stars; however, minor improvments are needed: (1) missing a stand which would help with viewing the display. (2) the wires/leads are too stiff making See full review