Multi-purpose tester for dry cell 1.5V batteries (AAA, AA, C, D and button-type), 9V batteries (PP3 /6LR61), household and automotive fuses, domestic filament bulbs, not suitable for CFLS or most LED bulbs and continuity testing. Readings display on the clear and simple analogue scale. There is also an audible continuity tester via test probes (supplied). Powered by a 9V PP3/6LR61 battery (available separately).