Features and Benefits: Heavy duty copper-plated clamps 100 amp load capacity 0-16 volt range Load safety switch prevents arcing Heavy duty chrome plated ventilated steel case Tests batteries on or off the car in just 10 seconds. Convenient portable size and easy-to-read scales.Features and Benefits:? Heavy-duty copper-plated clamps? 100 amp load capacity? 0-16 volt range? Load safety switch prevents arcing? Heavy-duty chrome-plated ventilated steel case? Works on both 6V and 12V batteries? Ceramic insulators? Determines state of charge cranking and charging volts? Determines good/bad status? Extra large display with zero adjust