1 x PP3 9V alkaline battery and instructions. CP41 and CP410. 4000 count LCD display AC & DC Current Measurement True RMS measurements with auto range High noise rejection ideal for testing AC power distribution control gear and AC/DC inverter drive systems High external field rejection High accuracy over full range Simple push button for data hold and auto zero Low battery indication on LCD display Auto power off conserves battery life EN61010 safety rating CAT III, 300V