Sper Scientific Dissolved Oxygen Pen

Simple to use, this dissolved oxygen pen is ideal for determining water quality in environmental testing, labs, industrial/municipal wastewater, aquariums, and fish hatcheries. The pen simultaneously displays dissolved oxygen and temperature readings, holds the readings, and recalls minimum and maximum readings. Designed for one-hand operation, the pen also features automatic temperature compensation and calibration to air. The polarographic probe has a built-in temperature sensor, and the pop-off probe head is easy to replace. IP67 waterproof and floats if dropped in water. Includes soft carrying case with belt loop, two spare probe heads, electrolyte solution, and 4 AAA batteries. One-year manufacturer’s warranty.