Comprehensive Water Quality Monitoring: Measures dissolved oxygen (DO) concentration (0-20.0 mg/L), oxygen saturation (0-100%), and water temperature (32-122°F / 0-50°C) with high accuracy. Automatic Temperature Compensation (ATC): Built-in temperature probe ensures accurate DO readings across varying temperatures. Altitude & Salinity Compensation: Adjustable settings (0-3900 meters altitude, 0-39% salinity) to enhance measurement accuracy in diverse environmental conditions. User-Friendly Interface: Features Min/Max and Data Hold functions for easy data capture and analysis. Complete Field Kit: Includes DO probe with membrane and 13ft (4m) cable, two spare replacement membranes, electrolyte, 9V battery, and soft carrying case for convenient transport. Takes quick measurements of Dissolved Oxygen or % Oxygen plus Temperature in water Automatic Temperature Compensation via temperature probe sensor built into polarography type oxygen probe Adjustable Altitude and Salinity Compensation