YSI 550A-100 Handheld Dissolved Oxygen Meter with 100' Cable and Probe, 0 to 50 mg/L, 0.01 mg/L, 0 to 500%, -5 to 45 degrees C, 9" Length x 4-11/16" Width

The YSI 550A-100 instrument is a dissolved oxygen (DO) and temperature meter for measuring DO in fresh, sea, or polluted water in the field, with a 100’ cable-probe assembly and a backlit LCD to enable reading in dark or dimly lit areas. This microprocessor-based, digital meter has automatic temperature compensation for DO, automatic salinity compensation (0 to 70ppt) for DO, and altitude compensation for calibration. The weighted, quick-sinking polarography probe has a field-replaceable electrode module and screw-on cap membrane. It runs on 4 alkaline C-cell batteries (included), has a waterproof case with Ingress Protection 67 (IP67), and has European Conformity (CE) certification. DO meters are commonly used in water-quality testing applications.