LaMotte 3883A-H Calcium Hardness Tablets are colorimetric reagent tablets used to test calcium hardness in pool and spa water. Designed for use with LaMotte visual comparators or photometers, these tablets help determine the amount of calcium in water, a critical factor in maintaining water balance and preventing scaling or corrosion. Each tablet is individually foil-wrapped to maintain integrity, protect from moisture, and extend shelf life. With 50 tablets per box, this format is ideal for residential or commercial pool testing routines that demand accuracy and convenience.