VTSYIQI Flow Velocity Meter Water Flow Speed Meter with Pole Positioning Measurement Temperature Range -10°C-50°C Speed Range 0.01-10.00 m/s Measurement Error ≤1. 5% for Open Channel River Stream

VTSYIQI Flow Velocity Meter Water Velocity Measurement Instruments with Flow Measurement Error ≤1.5% Speed Range 0.01-5.00 m/s Pole Positioning Measurement for Agricultural Drainage and Irrigation Hydrogeological Survey

VTSYIQI Fluorescence Dissolved Oxygen Analyzer Tester Meter with 99 Pen Data Storage Altitude Compensation 0-1000m Salinity Compensation 0-42ppt DO Measuring Range 0.0~15.0 (mg/L)/0~119.9% Accuary ±3.0%FS

VTSYIQI Fluorescence Dissolved Oxygen Detector Fluorescence DO Meter with Calibration 100.0% in Air 99 Points Records DO Measuring Range 0.0~15.0 (mg/L)/0~119.9% Accuary ±3.0%FS Salinity Compensation 0-42ppt

VTSYIQI Fluorescence Dissolved Oxygen Meter Fluorescence DO Meter with DO Measuring Range 0.0~15.0 (mg/L)/0~119.9% Resolution 0.1 mg/L Accuary ±3.0% FS Altitude Compensation 0-1000m Salinity Compensation 0-42ppt Automatic Calibration

VTSYIQI Fluorescence Dissolved Oxygen Meter Optical Dissolved Oxygen Meter Tester Detector with D.O. Range 0~15(mg/L )/0-119.9% Accuracy ±3%FS 3.5m Optical Probe Resolution 0.1 mg/L

VTSYIQI Fluorescence Dissolved Oxygen Meter Tester with Dissolved Oxygen Measuring Range 0.0-15.0 (mg/L)/0-119.9% Accuracy ±3.0%FS Salinity Compensation 0~42ppt 99 Pen Data Storage Temperature Measuring Range 0.0~50.0°C

VTSYIQI Fluorescence Dissolved Oxygen Tester Fluorescence DO Meter with Accuary ±3.0%FS Salinity Compensation 0-42ppt DO Measuring Range 0.0~15.0 (mg/L)/0~119.9% 99 Pen Data Storage Altitude Compensation 0-1000m

VTSYIQI Fluorescence DO Meter Fluorescence Dissolved Oxygen Meter Detector with Dissolved Oxygen Measuring Range 0.0-15.0 (mg/L)/0-119.9% Salinity Compensation 0~42ppt Calibration 100.0% in Air Altitude Compensation 0-1000m

VTSYIQI Fluorescence DO Meter Fluorescence Dissolved Oxygen Tester with DO Measuring Range 0.0~15.0 (mg/L)/0~119.9% Accuary ±3.0%FS Altitude Compensation 0-1000m for Aquaculture Mariculture Experimental Research Environmental Measurement

VTSYIQI Fluoride Ion Concentration Tester Fluoride Ion Meters with. Range-1999.9 to 1999.9 mV Calibration Fluid Range 0.02 to 1900 ppm Accuracy±0.5% F.S Automatic Temperature Compensation Function Automatic Power Off

VTSYIQI Fluoride Ion Meter Benchtop Fluoride Ion Meter with Calibration Fluid Range 0.02 to 1900 ppm Accuracy±0.5% F.S. Auto-Power Off Resolution 0.001 0.01 0.1 1 Automatic for Laboratory Applications