This waterproof instrument measures dissolved oxygen to determine water quality in environmental testing, industrial and municipal wastewater, aquariums and fish hatcheries. Designed for simple one-hand operation with automatic temperature compensation and calibration to air. The polarographic probe has a built-in temperature sensor and easy to replace probe heads. It has a hold function and displays dissolved oxygen and temperature readings simultaneously. It also recalls the minimum and maximum temperatures and dissolved oxygen amounts. Comes ready to use and includes a soft carrying case with belt loop, two spare probe heads, electrolyte and 4 AAA batteries. Dimensions: 18 x 4 x 4 cm. Warranty: 5 years.

Specifications
Dissolved Oxygen:
Range: 0 to 20.0 mg/L,
Accuracy: ±0.4% mg/L
Temperature:
Range: 32.0 to 122.0°F, 0 to 50.0°C,
Accuracy: ±1.5°F, ±0.8°C