PoolLab Calcuim Hardness Liquid Reagents Kit This is used with the PoolLab 1.0 photometer as a additonal test for measuring calcuim hardness of your swimming pool/ hot tub Range: 0-500ppm Contains 1 Dropper bottle of 20ml calcuim hardness 1 1 Dropper bottle of plus 20ml calcuim hardness 2. Good for 50 tests Sku:POL2020CH12
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