The YSI 550A adopts a fully watertight (IP67 waterproof grade), impact-proof instrument housing, and enables innovative dissolved oxygen electrode modules that can be replaced in the field.Dissolved oxygen and temperature can be measured simultaneously using YSI's proven polarographic technology and YSI's global high-precision temperature model.The next generation of PE cover films provide faster reaction times and lower stirring dependence.

1. Fully watertight, compliant with IP67 waterproof grade

2. The dissolved oxygen electrode module can be replaced in the field

3. Faster reaction time and lower stirring dependence

4. Stainless steel probe, durable, easier to sink into water

5. Stress soothing devices are installed at both ends of the cable to reduce material fatigue at the wiring and effectively extend the cable life.

6. Built-in dissolved oxygen calibration chamber/probe storage chamber for easy portability and maintain the normal working state of the probe

7. Available in 3.7, 7.5, 15 and 30 meters of cables to choose from

8. The dissolved oxygen measurement range is extended to 50 mg/L

9. Air saturation or milligram/liter calibration mode

10. 2000 hours of ultra-long battery life