YSI 55 Dissolved Oxygen Meter

The YSI Model 55-50 Handheld Dissolved Oxygen & Temperature System features an integral 50' cable assembly with probe.

The YSI Model 55-25 Handheld Dissolved Oxygen & Temperature System features an integral 25' cable assembly with probe.

The YSI Model 55-12 Handheld Dissolved Oxygen & Temperature System features an integral 12' cable assembly with probe.

The YSI Model 55D Handheld Dissolved Oxygen and Temperature display is designed for quick-connection to 55D-X cable assemblies.

This 50' cable assembly is designed for use with the 55D display and simultaneously measures DO in mg/L or % saturation and temperature.

This 25' cable assembly is designed for use with the 55D display and simultaneously measures DO in mg/L or % saturation and temperature.

This 12' cable assembly is designed for use with the 55D display and simultaneously measures DO in mg/L or % saturation and temperature.

This small, hard-sided carrying case fits most YSI handheld meters, including models 30, 55, 60, 63, 85, and 550A.

The YSI 5520 carrying case is an inexpensive way to protect and transport YSI handhelds with up to 25' cables.