YSI® 550A Waterproof Dissolved Oxygen Meters

Waterproof Dissolved Oxygen Meters Have Faster Response Times with Less Stirring Dependence

The innovative case design means no worries when the instruments are used in wet weather or dropped in water. Sensors have a unique stainless steel design that allows the weighted probe to sink easily. Membranes provide faster, more accurate results.
In addition to their waterproof, impact-resistant cases and field-replaceable probes, these Waterproof Dissolved Oxygen Meters have screw-on cap membranes and a 2,000-hour battery life. Meters display DO and temperature simultaneously in °C or °F with a built-in calibration chamber and manual salinity input from 0–70 ppt. Calibrate in mg/L or % saturation. Available with your choice of 12’, 25’, 50’ or 100'L cable. Waterproof Dissolved Oxygen Meters come with four alkaline C-cell batteries, measure 4.7"W x 9"L and weigh 2 lb.
550A Membrane Kit (No. 100684), Replacement Dissolved Oxygen Module (No. 221321), Probe Reconditioning Kit (No. 221328) and Procell C Batteries, Pkg. of 12 (No. 13268P) also available.
Compliance: IP67 rated.