[Merck Millipore Corporation] Mquant(TM) Total Hardness Test (Individual Packaging) Measurement Principle: Test Strip (4 Reaction Zone) (External Large Bag Alone Is Provided with Color Sample) <3->4->7->14->21°D <4->5->9->18->26°E <5->7->12->25->37°F Mquant(TM) 110032 1000Strips