The pH55 PRO is waterproof to IP65

5 ft cable

The HI731335's locking index tab ensures the cuvette is inserted in the same orientation for both blank measurements (zero) and sample readings

for increased accuracy with manual trimmers for easy adjustment

9V alkaline battery

Hanna Marine Calcium Checker HC Calibration Check Set - HI758-11 PFAS filtration The pH55 PRO is waterproofThe Marine Calcium Checker HC Calibration Check Set HI758 11 provides a simple solution to validating the Marine Calcium Checker HC HI758 that has a range of 200 to 600 ppm calcium. This high quality set of standards is manufactured in our state of the art facility and comes supplied with a Certificate of Analysis. The Certificate of Analysis provides the lot number, reference values and expiration date for traceability when certifying the CheckerHC.