Features: The Professional Dissolved Oxygen Meter is a indispensable tool for accurate and rapid measurement of dissolved oxygen in various water environment, ensuring precise water quality analysis. This digital DO meter boasts high precisions sensors and automatic temperature compensation, delivering reliable readings. For environmental scientists, aquaculture specialists, and fishery operators, it provide critical data to maintain conditions in ecosystems. This portable dissolved oxygen analyzer is perfect for on site measurements in seawater, fish tanks, and aquaculture farm, as well as for monitoring swimming pools and natural water body. With its user friendly one point or 2 point calibration system, long service life, and optional backlits, it ensures operation for professional dedicated to preserving water quality. Specifications: Material: Plastic Automatic Temperature Compensation: 0-40℃ Measurement: 0.0-40.0mg/L Dissolved Oxygen Saturation: 0.0-300.0% Temperature: 0.1-40.0°C; 32.0-104.0°F Support: Auto Backlits, Auto Shut Response time: ≤45s (90% response at 20℃) Battery: 3x1.5V LR44 Battery Requires(NOT Include) Size: About. 17x5x19cm/6.69x1.97x7.48in Package Includes: 1 Set Dissolved Oxygen Meter note: Please allow 1-2cm errors due to manual measurement. Due to difference between different monitors, the picture may not reflect the item actual color.