【10-in-1 Function】This is a water quality test kit with PH, TDS, EC, SG, ORP, H2, ㏁, temperature, fertility and salinity testing functions. Backlit LCD screen for easy reading of displayed values 【WIDELY USED】Ideal for use at home or in the laboratory. Ideal for testing pH balance in drinking water, swimming pools, aquariums, reverse osmosis systems, spas or hydroponics. 【Robust and Durable】This pool tester is IP67 waterproof with pH rating, so it can still be used even if it falls into the aquarium.