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Just buy a Taylor dpd test kit and be done with it.
how do you measure hardness though since the trutest doesn't do it? is it even that important to measure hardness?I wonder why the trutest DOESN'T do hardness but does the other 3? Their Accucheck regular dip strips do all four.
I must of missed the part of the instructions that said to multiply that number if you are using Bromine.. opps!