Salifert Potassium Test Kit  up to 40 Tests
 
This test kit is used to measure potassium levels in your aquarium. Levels outside of optimum range can disturb the nutrient turnover in the aquarium and have a damaging influence on coral growth. This test can detect concentrations of 250 ppm to 470 ppm optimum potassium levels should be kept between 380 and 420 ppm