VTSYIQI Portable pH Meter Digital Water pH Analyzer with Standard Calibration Solution Range -1999.9 to 1999.9 mV Stores Up to 500 Data Sets Accuracy ±0.2 mV Setup Menu Contains 9 Options Manual/Auto-read Measurement Endpoint

VTSYIQI Portable pH Meter Handheld Water pH Analyzer Portable pH Gauge Tester with Standard Calibration Solution Range -2.00 to 20.00 pH Accuracy ±0.01 pH Calibration 1 to 3 points Manual/Auto-read Measurement Endpoint USB Communication Interface

VTSYIQI Portable pH Meter Portable pH Gauge Tester with Standard Calibration Solution Range -2.000 to 20.000 pH Resolution 0.001/0.01/0.1 pH Selectable Accuracy ±0.002 pH Range -1999.9 to 1999.9 mV USB Communication Interface

VTSYIQI Portable pH Meter Temperature Meter with Calibration Liquids Range -2.000 to 20.000 pH Range -1999.9 to 1999.9 mV Resolution 0.1/1 mV Selectable Accuracy ±0.2 mV Auto-read Function USB Communication Interface USB Communication Interface

VTSYIQI Portable pH Meters Handheld pH Meter with Standard Calibration Solution Resolution 0.01 pH Calibration 1 to 3 points Range -1999 to 1999 mV USB Communication Interface Manual / Auto-read Measurement Endpoint 

VTSYIQI Portable pH Meters Portable pH and Temperature Meter with Calibration Liquids Range -2.000 to 20.000 pH Accuracy ±0.2 mV Stores Up to 500 Data Sets Setup Menu Contains 9 Options Manual/Auto-read Measurement Endpoint

VTSYIQI Portable PH/Conductivity Meter Multi Parameter Water Quality Meter with Conductivity Standard Solutions Accuracy ±0.002 pH Conductivity Range 0 to 20.00,200.0,2000 µS/cm,20.00,200.0 mS/cm for Measuring pH mV Conductivity TDS

VTSYIQI Portable pH/Conductivity/TDS/Salinity Meter Multi Parameter Water Quality Meter with Conductivity Standard Solutions Range -1999.9 to 1999.9 mV for Measuring PH,Oxidation Reduction Potential,Conductivity,TDS,Salinity,Resistivity

VTSYIQI Portable pH/Conductivity/TDS/Salinity Meter Multi Parameter Water Quality Meter with Conductivity Standard Solutions Range -1999.9 to 1999.9 mV for Measuring PH,Oxidation Reduction Potential,Conductivity,TDS,Salinity,Resistivity

VTSYIQI Portable pH/Dissolved Oxygen Meter Multiparameter Water Quality Meter with Conductivity Standard Solutions Range 0.00 to 20.00 mg/L/ 0.0 to 200.0% Saturation Manual/Auto-read Measurement Endpoint E201-BNC pH Electrode

VTSYIQI Portable PH3 Gas Detector Phosphine Gas Detector with Resolution 0.01ppm Accuracy ≤±3% F.S.Measuring Range 0 to 50ppm Automatic Data Storage Over 100,000 Sets of Stored Data Principle Electrochemical USB Interface

VTSYIQI Portable Phosphine Gas Detector PH3 Gas Detector with Gas Pump Sampling Method Measuring Range 0-20ppm L-Alarm 5ppm H-Alarm 10ppm Resolution 0.1ppm Accuracy ≦±5% F.S. for Petroleum Chemical Environmental Metallurgy