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