Pro20i Dissolved Oxygen Meter

Model 55, Pro20, and Pro20i Dissolved Oxygen Meter Comparison

The YSI Model 55 dissolved oxygen handheld was an extremely popular meter for YSI customers. Since it's discontinuation we've launched a few models to easily replace the Model 55 with much better benefits. This video compares the Model 55 to its direct replacement - the YSI Pro20i (https://www.ysi.com/pro20i) - and reviews improvements and features of the Pro20i. The Pro20 (https://www.ysi.com/pro20) is also reviewed, although it has a user-replaceable cable unlike the Pro20i and Model 55.

Price$1,092.00 (US Only)

Option

SKU607130

In Stock 0 - Available for Backorder

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The Pro20i is a handheld instrument for dissolved oxygen and temperature with an integral (non-detachable) cable. It is a direct replacement for the discontinued Model 55 and 550A instruments. Available YSI-compatible sensors are EPA-approved for reporting DO in wastewater compliance. Explore the ProSolo for an optical dissolved oxygen handheld.

Instrument, cables, probes/sensors included.

Order Meter

SKU	Description	Price	Quantity
607130	Handheld with 1-meter integral (non-detachable) cable and 2003 Polarographic sensor kit	$1,092.00	* * *
607131	Handheld with 1-meter integral (non-detachable) cable and 2002 Galvanic sensor kit	$1,092.00	* * *
607125	Handheld with 4-meter integral (non-detachable) cable and 2003 Polarographic sensor kit	$1,118.00	* * *
607129	Handheld with 4-meter integral (non-detachable) cable and 2002 Galvanic sensor kit	$1,118.00	* * *
607132	Handheld with 10-meter integral (non-detachable) cable and 2003 Polarographic sensor kit	$1,185.50	* * *
607133	Handheld with 10-meter integral (non-detachable) cable and 2002 Galvanic sensor kit	$1,185.50	* * *

Order Accessories

SKU	Description	Price	Quantity
605306	5908 - Replacement Standard Membrane Kit for 605203 Polarographic DO sensor	$79.25	* * *
603075	3075 - Pro Series Soft Sided Carrying Case	$160.50	* * *
603070	3070 - Shoulder strap	$39.25	* * *
605913	5913 - Replacement Standard Membrane Kit for 605202 Galvanic DO sensor	$81.25	* * *
603074	3074 - Pro Series Hard Sided Carrying Case	$371.00	* * *
603162	6262 - Pro Series Soft Sided Small Carrying Case	$116.50	* * *

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Overview
The YSI Pro20i dissolved oxygen meter is a rugged, user-friendly instrument for measuring dissolved oxygen. Depending on your needs, you can choose between a user-replaceable Polarographic DO sensor or a Galvanic DO sensor.

Top Features
- Integral (built-in) field cable in 1, 4, and 10-meter variations with user-replaceable DO sensors
- One Touch Cal for convenient and quick calibration
- Choice of DO sensor (Polarographic or Galvanic)
- Military spec connectors, IP-67 waterproofing, and 1-meter drop tested
- Rubber over-molded case
- Low total cost of ownership
- Internal barometer for highest accuracy
- Stores 50 data sets
- Graphic, backlit display and glow-in-the-dark keypad visible with polarized sunglasses on
- Multiple languages include English, Spanish, French, and German
- 3-year instrument warranty; 2-year cable warranty; 1-year polarographic sensor warranty; 6-month galvanic sensor warranty
- Fastest response time on the market with 95% response in 8 seconds with standard membrane
For a user-replaceable (detachable) cable alternative, YSI offers the Pro20 handheld with various BOD probe and DO assemblies.

Please visit our extensive dissolved oxygen resource page to learn about DO and BOD-related things: www.YSI.com/weknowDO.

You can also download The Dissolved Oxygen Handbook, which covers all things DO-related, from technologies to maintenance and calibrations to acquiring the best data.

Specifications

Cable Options	1- 4- 10-m lengths (3.28, 13.1, 32.8 ft.)
Certifications	RoHS, CE, WEEE, IP-67 waterproof, 1-meter drop test
Languages	English, Spanish, German, French
Memory	50 data sets
Power	2 alkaline C-cells providing ~400 hours of battery life (without backlight); low battery indicator when 1 hour is left
Size	8.3 cm width x 21.6 cm length x 5.6 cm depth (3.25 in. x 8.5 in. x 2.2 in.)
Warranty	3-year instrument; 2-year cable; 1-year polarographic sensors; 6-month galvanic sensors
Weight	475 grams (1.05 lbs.) (with batteries)

Accessories

Cap Membrane Kit 1.25 Mil PE

Cap Membrane Kit 1.25 Mil PE (6 each), Galvanic, includes electrolyte (yellow cap)

Cap Membrane Kit 1.25 Mil PE

Cap Membrane Kit 1.25 Mil PE (6 each), Polarographic, includes electrolyte (yellow cap)

Pro Series Galvanic Dissolved Oxygen Sensor

YSI 2002 Galvanic Dissolved Oxygen sensor for the Pro Series

Pro Series Polarographic Dissolved Oxygen Sensor

YSI 2003 Polarographic Dissolved Oxygen sensor for the Pro Series (Yellow Membrane Kit)
Video

Model 55, Pro20, and Pro20i Dissolved Oxygen Meter Comparison

The YSI Model 55 dissolved oxygen handheld was an extremely popular meter for YSI customers. Since it's discontinuation we've launched a few models to easily replace the Model 55 with much better benefits. This video compares the Model 55 to its direct replacement - the YSI Pro20i (https://www.ysi.com/pro20i) - and reviews improvements and features of the Pro20i. The Pro20 (https://www.ysi.com/pro20) is also reviewed, although it has a user-replaceable cable unlike the Pro20i and Model 55.