The Phosphate High Range Checker® HC Calibration Check Set - HI717-11 provides a simple solution to validating the Phosphate High Range Checker® HC - HI717 that has a range of 0.0 to 30.0 ppm (mg/L). 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 Checker® HC - Supplied with Certificate of Analysis - Standard value of 15.0 +/- 1.5 ppm phosphate @ 25°C - Reusable with long shelf life stability