AERO-GRO 5-in-1 TDS/pH Meter - IP67 Waterproof, 5 Functions: pH, TDS, EC, Salinity, Temperature, 0.01 Resolution, High-Accuracy Pen-Type Tester for Hydroponics, Water, Wine, Spas, Aquariums, White Hach Company bromine and iodine in the

bromine and iodine in the unique ratio required by corals

and carbohydrates

Salinity and Temperature

and this salinity tester has an automatic temperature compensation function(32°F~140°F)

and the validity period is 24 months

AERO-GRO 5-in-1 TDS/pH Meter - IP67 Waterproof, 5 Functions: pH, TDS, EC, Salinity, Temperature, 0.01 Resolution, High-Accuracy Pen-Type Tester for Hydroponics, Water, Wine, Spas, Aquariums, White Hach Company bromine and iodine in theBrand: Aero Gro Color: White Features: [5 in 1 pH METER] Meter has a five in one function, which can measure PH, TDS, EC (Electrical Conductivity), Salinity %, Salinity ppm, and Temperature with high precision every time. All round measurement of water quality to ensure consistent results. [Accurate pH Tester] Featuring a solid glass probe, you can get a full measurement range of 0 14pH, 0. 01 pH resolution. The pH meter uses a 3 point calibration for