Three result: red=replace, yellow=low power, green=goodIf needle does not move,check that battery is touching both contacts before assumingthat it is completely dead.The battery tester may be used to test the following sizes:1.5V:AAA,for HP16, MN2400, R03AA, HP7, MN1500, UM3C, HP11, MN1400, SP11, LR14, UM2D, HP2, MN1300, SP2, R20,UM19V: PP3, MN1604, 6F22, 006P