... of high quality, widely used to test water ph of fish farms swimming pools and aquarium Technical Parameters ... Accuracy Grade 0.02 Stability ≤0.03pH/24h PH standard solution 4.00/7.00/10.01, ... Temperature compensating 0~99.9°C(pH) PH calibration range zero-point ±1.45 pH, slope±30% Control buttons ... pH/ORP Tcombination electrodesSize 96×96×145mm Size of installation cut-out 92×92 mm Weight 900g ph meter