The only truly affordable and accurate digital calcium measurement instrument. Powered by a 9-volt battery (not included), it will operate for approximately 150 total hours before battery replacement is visually indicated on the display. Comes complete with Calcium Meter, Calcium Selective Probe with 10' high supression cable and BNC connector plus all necessary Calibration fluids. Given proper care, the PINPOINT Calcium Monitor should last a lifetime. Optional: AC Adapter Kit. Information: User Guide