Luster Leaf BB800 Battery, Bulb and Fuse Tester Battery, bulb and fuse tester Eliminate an unplanned experimental variable Handy device tests all AAA, AA, C, D, 9-volt and button batteries, including rechargeables; all standard light bulbs; and fuses Dual scale measures battery voltage or capacity Requires 9-volt battery, not included Incredibly useful tool is a must for any home or shop Simulated load test to check if batter will work in use Also for checking bulbs and fuses Built-in storage compartment 9V Battery not included