The HI758 Checker®HC (Handheld Colorimeter) provides a simple, accurate and cost-effective way to measure calcium.Calcium, colorimeter, handheld colorimeter
There are two natural forms of ionic chromium, the hexavalent ion, Cr (VI) and the trivalent Cr (III). Cr (III) is much less toxic than Cr (VI) and seldom found in potable waters. Cr (VI), however, is toxic to humans ...