BT6 is the Battery Checker. Every home should have this unique ... . Tests all AAA, AA, C, D, 9V and button batteries, whether general-purpose, alkaline or rechargeable. ... (not included).Test fuseTests auto and household fusesTest light bulbTests auto and household bulbsSpecificationsThe batteries which can ... , SP2, R20,UM1PP3, MN1604, 6F22, 006PTest bulb and fuseWhen the needle is in the green area, the ...