YSI 550A Waterproof Dissolved Oxygen Meter

Faster response; less stirring.

The waterproof case design means there are no worries when the instrument is used in wet weather, or if the instrument is dropped in water. The sensor has a unique stainless steel design that allows the weighted probe to sink easily. Membranes provide faster, more accurate results. In addition to its waterproof, impact-resistant case and field-replaceable probe, this meter has screw-on cap membranes and a 2000-hr. battery life. Displays D.O. and temperature simultaneously in either °C or °F with a built-in calibration chamber and manual salilnity input from 0–70ppt. Calibrate in mg/L or % saturation. Available with your choice of 12'L, 25'L, 50'L or 100'L cable. Comes with four alkaline C-cell batteries providing 2000 hours of battery life. Measures 4.7"W x 9"L and weighs 2 lbs.
Compliance: IP-67.