Power Probe III w/Case & Acc - Red (PP319FTCRED) [Car Automotive Diagnostic Test Tool, Digital Volt Meter, AC/DC Current Resistance, Circuit Tester] Supply Power or Ground for Functional Component Testing Works on 12 - 24 Volt Range Power Cable Length of 20 Feet DC Voltmeter Indicators provide active feedback Resettable 8 Amp Circuit Breaker; Continuity Tester; Component Tester