Deliver the correct volume of DPD reagent for free or total chlorine accurately using these portable dispensers. Simply invert the dispenser over the sample tube and press the button to dispense reagent. The powder dissolves quickly in the sample with no messy residue. Use the DPD powder formulation for Hach, HF scientific, and Hanna colorimeters. Use the tablet formulation for LaMotte, Orbeco-Hellige, Palintest, Thermo Scientific Orion, and Tintometer units. Dispensers provide enough DPD powder for 100 tests for 5-mL samples or order multi-packs of five dispensers with 200 tests each for 10-mL or 25-mL samples.