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Features: Pen size 3-in-1 Water tester Measure pH, EC, and temperature with ATC Easy calibration Selectable °C/°F temp unit With backlight Specifications: Measurement Range pH: 0.00~14.00pH EC: 0~19990uS/cm Temperature: 0~50°C (32~122°F) Resolution: pH: 0.01pH EC: 10uS/cm Temperature: 0.1°C (0.2°F) Accuracy pH: ±0.1pH EC: ±2%F.S. Temperature: ±1°C (±2°F) Battery Type: 4 x 1.5V (AG13) ATC: 0~50°C Environment Temperature: 0~50°C Dimension: 188 x 35 x 35mm Weight: 98g Set Includes 1 x Water Quality Tester 3 x Calibration Buffer Powder (pH 4.01, pH6.86 and pH9.18) 1 x Calibration Solution (EC 1413) 1 x English User Manual