Universal Button Battery Checker Tester AA AAA C D 9V 't for Which Batteries to Keep and Which to throw , Place your battery between the two points of the battery tester, and the easy-to-read display will tell you instantly whether you have a dud, or if you can out another few minutes of battery life. Checks power level of all 1.5V & 9V batteries Easy to read, colour coded meter indicates power level Tests 1.5V miniature cells Three : red=replace, yellow=low power, green=good If needle does not move,check that battery is touching both contacts assuming that it is completely dead. The battery tester may be used to test the following sizes: 1.5V: AAA,for HP16, MN2400, R03 AA, HP7, MN1500, UM3 C, HP11, MN1400, SP11, LR14, UM2 D, HP2, MN1300, SP2, R20,UM1 9V: PP3, MN1604, 6F22, 006P NOTE: The battery tester is activated by the battery being checked. Keep test as short as possible, to avoid unnecessary battery drain. Note:AAA battery not include type: Battery Tester color:Black+red Material:ABS Package Contents: 1 x Battery Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.