The HI717 CheckerHC (Handheld Colorimeter) provides a simple, accurate and cost effective way to measure phosphate. Phosphate is a common food additive that enhances flavor and acts as a buffering agent. Important for growth and development of plant roots, phosphate is also present in fertilizers. However, high concentrations of phosphates are detrimental to the environment; for this reason, it is closely monitored in both natural and municipal water systems. Designed as a more accurate alternative to chemical test kits, the HI717 provides quick, accurate results. Features at-a-glance: Easier to use and more accurate than chemical test kitsDedicated to a single parameterSmall size, big convenienceIdeal for: Water Quality, Aquaculture, Education, Industrial, Agriculture Specifications Range = 0.0 to 30.0 ppm Resolution = 0.1 ppm Accuracy = @ 25C/77F1.0 ppm 5% of reading Light Source = LED @ 525 nm Light Detector = silicon photocell Method = adaptation of the Standard Methods for the Examination of Water and Wastewater, 18th edition, Heteropolymolybdenum Blue method Environment = 0 to 50C (32 to 122F); RH max 95% non-condensing Battery Type = (1) 1.5V AAA Auto-offafter ten minutes of non-use Dimensions = 81.5mm x 61mm x 37.5mm (3.2\ x 2.4\ x 1.5)Weight64 g (2.25 oz.) Ordering Information = HI717 Checker is supplied with (2) sample cuvettes with caps, phosphate HR reagent starter kit for 20 tests (1 bottle of phosphate HR reagent A, 20 packets of phosphate HR reagent B), battery, instructions and quick start guide.