Bell & Howell Battery/Bulb/Fuse tester helps keep all your frequently used appliances and devices powered up and ready to go. Easy-to-read display tells you whether any battery is in poor, weak or good condition. Saves money and energy! Accurately tests power level of all A, AA, AAA, C, D and 9 volt batteries, plus fuses and bulbs. Uses one 9V battery (not incl.).