The Taylor K-1770 calcium harness test kit will help your water quality in check by determining if your harness is to high or low.
Taylor Technologies Drop Test Kit, Testing Parameter: Calcium Hardness, Range: 10 ppm, Method/Chemistry: EDTA Titration, Includes: 5092, (1) 7008, (1) 7266, (1) 8125, (1) 9198, (1) R-0010-A, (1) R-0011L-A, (1) R-0012-A