Dissolved Oxygen and Temperature Meter

The YSI Pro20i is a dissolved oxygen and temperature meter ideal for quick spot sampling of wastewater and receiving waters. Easy to use, rugged and reliable, the YSI Pro20i puts the measurement of dissolved oxygen in your hands.

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The YSI Pro20i is a dissolved oxygen and temperature meter ideal for quick spot sampling of wastewater and receiving waters. Easy to use, rugged and reliable, the YSI Pro20i puts the measurement of dissolved oxygen in your hands.

The YSI Pro20i has easy-to-use features like one-touch calibration and easy-to-change PE cap membranes. Designed for rugged conditions, it has a waterproof case and comes with 3-year warranty protection.

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Xylem’s Pro20i dissolved oxygen and temperature meter is ideal for quick spot sampling.

The device comes with a backlit display for low- or no-lighting conditions. The integral (non-detachable) cable is available in lengths of 1, 4, and 10 meters. The YSI Pro20i can be used with an instant-on galvanic sensor or longer-lasting polarographic sensor, both providing an accuracy of +/- 0.2 mg/L.

Additional features include: user-replaceable DO sensors; one touch calibration for easy DO calibrations within 3 seconds with the press of a button; automatic barometric pressure compensation; 95% response time in approximately 8 seconds with standard membrane; storage of 50 data sets so there is no need to write down data; large graphic, backlit display and glow-in-the-dark keypad; tough, IP-67, impact-resistant, waterproof case; rubber over molded case for extra durability; multiple languages: English, Spanish, French, and German; and 3-year instrument, 2-year integral cable, 1-year polarographic sensors, and 6-month galvanic sensor warranty.


YSI is a developer and manufacturer of sensors, instruments, software, and data collection platforms for environmental water quality monitoring and testing. To learn more, visit ysi.com.

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