Looking for a rugged, field-worthy instrument for measuring dissolved oxygen? The new YSI 550A DO instrument features a waterproof (IP-67), impact-resistant case and innovative field-replaceable DO electrode modules. Measure dissolved oxygen and temperature simultaneously using YSI’s proven polarographic technology for oxygen and YSI Tem-perature Precision” thermistors, the planetwide standard for accuracy. Our new PE membranes provide faster response times with less stir¬ring dependence – saving time with every reading!
Measurements are fast and easy with one-hand operation, an easy-to-use backlit display, low-battery indicator, automatic push-button calibration, and a weighted, quick-sinking probe. The YSI 550A DO has a built-in calibra¬tion chamber, direct salinity, temperature, and altitude compensation. The instrument provides simultaneous readings of oxygen and temperature.