OTC 100 Amp Battery Load Tester Tests batteries on or off the car in just 10 seconds. Convenient portable size and easy-to-read scales. Determines good/bad status with an extra-large display with zero adjust. Determines state-of-charge cranking and charging volts. It features heavy-duty copper-plated clamps, 100 amp load capacity, 0-16 volt range, load safety switch that prevents arcing, ceramic insulators, and a heavy-duty chrome-plated ventilated steel case.