The Silica Low Range Checker® HC Calibration Check Set – HI-705-11 provides a simple solution to validating the Silica Low Range Checker® HC – HI-705 that has a range of 0.00 to 2.00 ppm (mg/L). This high-quality set of standards comes supplied with a Certificate of Analysis. The Certificate of Analysis provides the lot number, reference values and expiry date for traceability when certifying the Checker® HC.