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LaMotte Calcium Hardness #1 for ColorQ Pro 7 - 1 Oz (30 mL) Bottle - 7042-G Safety Cover Step Location This is a 2 ounceThis is a 1 ounce bottle of LaMotte Calcium Hardness #1 reagent. This Calcium Hardness #1 Reagent is for use with the ColorQ Digital Photometer Testing Kits, Versions above 1. 4.