55 Dissolved Oxygen Instrument

Dissolved Oxygen Meter Comparison: Model 55 vs. Pro20 and Pro20i

The YSI Pro20i has replaced the discontinued YSI Model 55 dissolved oxygen handheld. This video reviews the Model 55 with the Pro20 and Pro20i, with the Pro20 offering a user-replacable cable, unlike the Pro20i and Model 55.

PriceDiscontinued

Option

SKU055200

Request a Quote For Replacement

The YSI model 55 dissolved oxygen instrument has been discontinued. YSI will continue to support existing model 55's through 2020. We recommend the Pro20i as a direct replacement. The Pro20 and ProSolo handheld instruments are also suitable replacements.

Overview
Offering push-button calibration with a built-in calibration chamber, direct salinity, and altitude compensation, the YSI 55 provides simultaneous readings of oxygen and temperature.

Dissolved oxygen readings are automatically compensated for temperature.

Features:
- Large, backlit display
- 12, 25, or 50 foot cables
- IP-65 water tight
- Low-battery indicator
- CE compliant
Do you have an old meter such as the 55 that you'd like to trade in for a discount on a new ProSolo ODO/T system? Check out the Pro Series Trade-In Promotion going on now (U.S. only).

Be the envy of your co-workers by winning a ProSolo ODO/T system! Enter to win a ProSolo optical DO system.

Specifications

Certifications	IP-65 (water resistant), CE compliant
Graphic Display	Graphic, backlit display
Logging Capabilities	Single
Measurement Range	Dissolved Oxygen-0 to 200% air saturation/0 to 20 mg/L, Temperature--5 to 45°C
Parameters Measured	Dissolved Oxygen, Temperature
Power	2 alkaline C-cells provide 400 continuous hours at ambient temperature without backlight
Sampling	Yes
Unit of Measure	Dissolved Oxygen-% air saturation, Temperature-°C, mg/L
User Calibratable	Yes
Warranty	2-year instrument
Waterproof	IP-65 (water resistant)

Accessories

Membrane Kit, Standard, includes electrolyte (1 mil)

Membrane Kit, Standard, includes electrolyte (1 mil)
Video

Dissolved Oxygen Meter Comparison: Model 55 vs. Pro20 and Pro20i

The YSI Pro20i has replaced the discontinued YSI Model 55 dissolved oxygen handheld. This video reviews the Model 55 with the Pro20 and Pro20i, with the Pro20 offering a user-replacable cable, unlike the Pro20i and Model 55.