Easier to use and more accurate than chemical test kits, this meter is small on size, but big on convenience. Ideal for testing in natural, waste, and drinking waters, the meter easily fits into the palm of your hand for quick and accurate readings. The instantaneous analysis of orthophosphate by colorimetric determination provides rapid results using a standard analysis technique. And, this unit is extremely simple to use. First, zero the instrument with your water sample. Next, add the reagent. Last, place the vial into the Checker, press the button and read the results. Meter is designed to work with HANNA’s powder reagents and 10 mL glass cuvettes. Operated by a single AAA battery. Range: 0.00 to 2.50 ppm (mg/L). Resolution: 0.01 ppm (mg/L). Precision: ±0.04 ppm(mg/L) ±4% of reading @ 25°C. Size: 3.2" x 2.4" x 1.5". Weight: 64 g.