Test kit, phosphorus, orthophosphate (reactive) , model PO-19

Method / Chemistry: Color disc / Ascorbic acid. Range (mg/L): 0-1, Smallest Increment- 0.02. Range (mg/L): 0-5, Smallest Increment- 0.1. Range (mg/L): 0-50, Smallest Increment- 1. Approx. Number of Tests: 100. Case Style: 12x7.25x6 inches Blue Polypropylene Carrying Case.