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HI-772-11 Calibration Checking Set For The HI-772 Marine Alkalinity Checker Starfish 8kW and 10kW models nowHanna HI 772 11 Calibration Checking Set For The HI 772 Marine Alkalinity Checker The HI 772 11 is a calibration checking set for use with the HI 772 Marine Alkalinity checker. The Marine Alkalinity (dKH) Checker HC Calibration Check Set HI 772 11 provides a simple solution to validating the Marine Alkalinity Checker HC HI 772 that has a range of 0. 0 to 20. 0 dKH.