1 x PP3 9V alkaline battery & instructions. CP3 Series AC/DC 30A ac/dc Current Probes. Precision current clamp suitable for non-intrusive current measurements in electrical electronic, process and light industrial systems automotive systems, battery performance testing and battery charging systems. 30A ac/dc measurement range Simple push button auto zero Auto power off conserves battery life wide bandwidth & high external field rejection Excellent accuracy over full range EN61010 Safety Rating CAT III 300V