YSI Model 55

Handheld DO Meter

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The YSI 55 is handheld, accurate, and an industry standard for field DO measurements. The large, backlit, LCD display simultaneously reads temperature and dissolved oxygen in either % saturation or mg/L. Calibration is easily performed using the built in probe storage chamber. Accuracy is increased by automatic temperature compensation and manual corrections for salinity and altitude.

YSI’s new handheld DO meter, the Pro20, is the suggested replacement for the YSI 55.

The YSI 55 is accurate to within 2 % saturation or .3 mg/L with a range of 0 to 200% saturation and 0 to 20 mg/L. The housing is IP65 rated water resistant and self diagnostics are ran at each startup to confirm proper operation. The probe features a stainless steel body to add both durability and act as a weight. Rugged and field ready, the YSI 55 is availble with built in cables in lengths of 12, 25, and 50 feet, or as a detachable cable version. Power is provided by 6 AA alkaline batteries (included), which can operate the instrument for up to 100 hours.

YSI also manufacturers the economical EcoSense DO200 and the new ProODO optical DO meter. Both feature detachable probes and the ability to switch from field DO cables to lab BOD cables by simply swapping the cable.

YSI 55 Handheld DO Meter Features

• Automatic temperature compensation
• manual salinity and altitude compensation
• Large display with backlight
• Cables in lengths up to 50 ft
• Water resistant casing (IP-65)
• 2 year warranty

YSI 55 Handheld DO Meter

Call to Order
1-888-234-5678

• 1 Includes: YSI 55 DO meter with attached cable/probe assembly, p/n 098094 membrane kit, 6 AA alkaline batteries, and a user manual
• 2 Includes: YSI 55 DO meter with detachable cable option, 6 AA alkaline batteries, and a user manual
• 3 Requires a cable and probe assembly

YSI 55 Replacement DO Probe Membranes

Call to Order
1-888-234-5678

• 1 Includes: 30 membranes, 2 o-rings, electrolyte solution, and instructions

YSI 55 Accessories

Call to Order
1-888-234-5678

• 1 For YSI 55 with cable lengths up to 25′ only