The only truly affordable and accurate digital calcium measurement instrument. Powered by a 9-volt battery or the PinPoint AC Adapter Kit (not included, the PinPoint Calcium Monitor will operate for approximately 150 total hours before battery replacement is visually indicated on the display). The PinPoint Calcium Monitor comes complete with Calcium Meter, Calcium Selective Probe and Calibration/probe fluids.User Guide (AmericanMarineUSA.com Web site in new window)