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Compatible with PoolLab 2.0 - Reagent in DPD #2 tablets, specially designed for accurate measurements with PoolLab 2.0 photometer. Chloramine measurement – To determine combined chlorine (chloramines) in pool and spa water in the range of 0.00-6.00 mg/l (ppm). EASY TO USE - Individually wrapped tablets for clean, safe and accurate dosing. Long service life: high quality reagents with a 2 year shelf life, ideal for regular water analysis. 50 Tablets - Handy pack of 50 pieces (TbsPD250) for effective pool and spa water care.