Red Sea KH/alkalinity pro refill test kit is an advanced titration test, measuring the level of buffers in reef aquarium to an exceptionally high accuracy of 0. 05 meq/l (0. 14 dkh). This test refill replenishes KH/alkalinity pro test kit with sufficient reagent to conduct another 75-tests. Alkalinity pro refill test kit boasts a new level of convenience for reef aquarium hobbyists. Routine and precise measurement of aquarium alkalinity (buffer) levels is essential for successful coral reef aquariums. This advanced alkalinity titration test kit encourages proper testing skills with ease-of-use.