Review on American Marine PINPOINT Monitor Calibration by Brenda Thompson

Excellent product. Just calibrated. The probe was broken when I first bought it. But I received the second block and there were no problems with the calibration. The calibration liquid should be provided in vials or other containers to facilitate sensor immersion. I used (heavy and strong) plastic cups to pack the calibration bags. Do not discard the liquid as you risk contaminating the solution. Stays in the pan for continuous PH monitoring.