Aquatic Eco-Systems

YSI® Y55 Dissolved Oxygen (D.O.) Meters

Not waterproof, but a great value.
The Y55 series is our most popular handheld meters. They feature easy push-button calibration, a probe storage chamber and a large simultaneous display of oxygen and temperature (°C and °F). They read in mg/l or percent of oxygen and offer built-in altitude (0–10,000') and salinity calibration (0 to 40 ppt). The large backlit digital display is easy to read in sunlight and darkness. They even have a low battery indicator. Expect 350 hours from the 6 AA alkaline batteries (included).

On these models, probe and cable are not removable but, if you send them to our YSI Repair Center, we can replace them.

The Y55D Series dissolved oxygen meters feature a detachable cable, making probe and cable changes a snap. They're accurate, durable and have long been considered the industry standard—so reliable, in fact, that they are backed with a 2-year warranty (one-year warranty on probes). Splashproof housing, stainless steel probe. Made in USA.

D.O. Ranges: 0–20 mg/L, 0–200% air saturation. Resolution: .01 mg/L. Accuracy: ±.25 mg/L, ±2% air, ±.4°C. Response Time: 90% in 10 seconds, 95% in 15 seconds.

Note: YSI recycles all instruments, probes and cables. Learn more about YSI's recycling program.

See comparison of all YSI® D.O. meters.

YSI® is a registered trademark of YSI, Inc. 

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