Multi Purpose Use - can be used to test different type of household batteries like AA, AAA, C, D, 1.5V,9V and button type Require on Battery - activated by the battery being checked, no battery needed for operation Simple but Effective - compact size and lightweight, portable effective battery tester, a must buy for anyone who uses regular or rechargeable batteries on a regular basis Easy to Use - identify battery status simply by the analog display needle, "good" (green), "low" (yellow), and "replace/recharge" (red) Product Description Tons of batteries all over the house yet cannot find a good one to replace? Still have no idea which battery to keep and which to throw away? Things seem to be running a bit slow? Still running slow after you replace the batteries? Get WUJUN Battery Tester to help you find useful battery! Test batteries in seconds, tells you when its time to get a new one. Read more User-Friendly ---Easy to read ---Quickly test battery level ---Compact size and lightweight design ---Self-powered, no need internal battery Read more WUJUN Battery Tester can be used to test the following sizes : 1.5V -----AAA,HP6,MN2400,RO3,AA,HP7,MN1500,UM3C,HP11, MN1400,UM2,D,HP2,MN1300,UM1 and Cell Button Type batteries. 9V ----- PP3,MN1604,6F22,006P