This Battery Bulb Fuse & Continuity Tester from Draper is for use with dry cell 1.5V batteries (AAA, AA, C, D & button-type), 9V batteries (PP3 /6LR61), household & automotive fuses, bulbs (with bayonet fitting & push/screw type torch light bulbs). The reading show up on a clear & easy to read scale while an audible continuity tester is also provided via the test probes that are included with the unit.