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AOLILONG PHS-2C digital display acidity meter PH Measurement range 0~14.00pH, PH Measurement accuracy +/- 0.02PH, temperature compensation (0~60) ℃, input Impedance ≥ 1012Ω, use conditions Environmental temperature 0~45 ℃, Relative Humidity ≤ 85% RH; ORP Measurement accuracy +/- 0.1% F. S, ORP Measurement range 0~ +/- 1999mV.