Trace Hardness Test Kit. 1 drop=0.5 ppm as CaCO3/25ml. Reagents Included: HZED2064-B, Trace Hardness Titrant, 60ml; HZHA7407-A, Trace Hardness Buffer, 30ml; HZHA7475-H, Hardness Indicator Powder, 10g.
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