Batt-O-Meter From Keith McMillen Instruments
Test pedal device batteries without removing battery from test Test lead with 1/4 inch connector plugs directly into your device Also works as handheld battery tester Tests 9Volt, AA, AAA, C & D Cells Digital readout provides all these readings:VoltageHours remaining for normal usePercent battery lifeType of battery being testedMore Includes Duracell Procell 9 Volt battery at no additional charge