GAOTek Acidity Conductivity Dissolved Oxygen Meter

Description Features LCD Display with Backlight Control Intelligent Microprocessor with Auto Functions Identify 8 Conductivity Standard Solutions Advanced Dissolved Oxygen Measurement Mode Polarographic Electrode for Multi-parameter Measurement Quick Electrode Polarization, Easy Replacement Advanced Conductivity Measurement Technology Switchable Modes: Conductivity, TDS, Salinity, Resistivity Nonlinear Temperature Compensation for Conductivity User-Friendly Design: Bracket Style, Non-slip Grip Automatic Temperature Compensation IP57 Waterproof, Calibration Solution, Portable Suitcase   Technical Specifications pH Measurement Range -2.00 pH to 19.99 pH Resolution 0.1 pH or 0.01 pH Accuracy Electric meter: ± 0.01 pH, matching: ± 0.02 pH Input Current ≤2 × 10-12 A Input Impedance ≥1 × 1012 Ω Stability ±0.01 pH / 3 h Dissolved Oxygen Measurement Range (0 mg/L (ppm) to 20.00 mg/L (ppm) (0% to 200.0%) Resolution 0.1 mg/L (ppm) or 0.01 mg/L (ppm) (1% or 0.1%) Accuracy Electric meter: ± 0.10 mg/L, matching: ± 0.40 mg/L Response Time ≤30 sec 77 °F (25 ℃), 90% response Residual Current ≤0.1 mg/L Salinity Compensation Range 0 ppt to 45 ppt Air Pressure Compensation Range 0 bar to 2 bar (0 kPa to 200 kPa) (manual) Data Storage 150 sets Automatic Calibration Air saturated with water; Water saturated with air Electrode Type Polarographic Storage Content Number, measurement value, measurement unit, and temperature value. Conductivity Measurement Range Conductivity: (0.00 μS/cm to 19.99 μS/cm) (20.0 μS/cm to 199.9 μS/cm) (200 μS/cm to 1999 μS/cm) (2.00 mS/cm to 19.99 mS/cm) (20.0 mS/cm to 199.9 mS/cm) TDS 0 g/L to 100 g/L Salinity 0 ppt to 100 ppt Resistivity 0 MΩcm to 100 MΩcm Resolution 0.01 μS/cm or 0.1 μS/cm or 1 μS/cm 0.01 mS/cm or 0.1 mS/cm Accuracy Electric meter: ± 1.0% FS, matching: ± 1.5% FS Electrode Constant 0.1 cm-1 or 1 cm-1 or 10 cm-1 Environmental Humidity ≤ 85% IP Grade IP57 dustproof and waterproof Power Supply 2 AA batteries (1.5 V × 2) Dissolved Oxygen Temperature Compensation Range 32 °F to 210.2 °F (0 ℃ to 99 ℃) Conductivity Temperature Compensation 32 °F to 212 °F (0 ℃ to 100 ℃) Conductivity Reference Temperature 77 °F, 68 °F, and 64.4 °F (25 ℃, 20 ℃, 18 ℃) pH Temperature Compensation Range 32°F to 212°F (0℃ to 100℃) Environmental Temperature 41 °F to 95 °F (5 ℃ to 35 ℃) (0.01 level) Size 2.55 in × 4.72 in × 1.22 in (65 mm × 120 mm × 31 mm) Weight 0.39 lbs. (180 g)