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For Free Chlorine, Bromine & Ozone - DPD No. 1 tablets allow precise measurement of free chlorine, bromine and ozone in the water. Compatible with PoolLab 1.0 & 2.0 - Designed for reliable use with PoolLab photometers for pool and spa analysis. EXACT MEASUREMENT RANGE - Captures values from 0.0 to 8.0mg/l (ppm) for effective water quality control. Observe correct use - do not touch tablets with hands. Fully crush and dissolve before measurement. Long shelf life - Up to 2 years shelf life when stored in cool, dry storage. Contains 50 tablets.