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The ColorQ PRO 6 handheld pool and spa professional photometer directly measures Free Chlorine (DPD), Total Chlorine (DPD), Bromine (DPD), pH, Alkalinity, Calcium Hardness and Cyanuric Acid (Stabilizer) directly on a digital display. The ColorQ eliminates the need to visually determine slight color variations, thus taking the guesswork out of poolside water analysis. Reagents sold separately. This is a replacement meter for the ColorQ PRO 6 Kit.