It can test swimming pool or freshwater tank, pond or nature aquarium or reff tank. An aquarium's happy life starts from here. GH testIntroduction: General hardness indicates levels of Ca and Mg ions, it is an importantcriterion for water quality. Most of fishes or water plants can only surviveunder a suitable GH circumstance. GH stands for water general hardness.Represented by 0GH. 10dGH means 1 mg of calcium oxide is indicated out of 100ml ofdistillde water.GH test kitcontents:1x22ml test reagent1x22ml test reagenttest vialxolor scaleInstructions & Recommendations

GH test kit (Aquarium)