Calcium Issue

[Myka]

I don't like the Hanna checker for calcium either. I think the trouble is with the very tiny amount of sample water (0.1 mL). Measuring such a tiny amountis difficult - even with a 1 mL syringe. If you're off by 0.01 mL that's 10% which accounts for 40-44 ppm +/-. So if your calcium is 440 you could easily get a reading anywhere from 400-480 ppm. I don't like that. I don't doubt the test kit is accurate, I think there is a high rate of user error.