YSI Pro20

Handheld DO Meter

YSI Pro20 - Handheld DO Meter

The Pro20 handheld DO meter can switch between lab and field work in a matter of seconds due to its interchangeable cables and probes. Featuring some of the fastest response times in a handheld DO meter (< 8 seconds), automatic barometric compensation, salinity compensation via user supplied values, and easy one touch calibration, the Pro20 allows you to complete your field work quickly and accurately.

The Pro20 is the suggested replacement for both the YSI 55 and the YSI 550A.

The large, graphic, LCD display is easy to read (visible even while wearing sunglasses), and both the display and keypad are backlit. The Pro20 can store 50 sets of data for later review, eliminating the need to write results down. Field cables are available in lengths ranging from 1 to 100 meters, and can use either galvanic or polarographic DO probes. A 2 meter cable with a self stirring BOD probe is also available for lab use.

When deciding between galvanic or polarographic field DO probes, the deciding factor is sensor warmup time vs longetivity. Galvanic sensors require no warmup period and can begin taking readings immediately. Polarographic sensors need 5 to 15 minutes of warmup before measurements can be taken, but have a longer sensor life. Both types of DO probes provide accurate measurements and fast response times.

Like the rest of the Professional Series line from YSI, the Pro20 is IP67 rated (even with the battery cover off), floats, and has military spec connectors. The interface is easy to use and can operate in multiple languages. Power is provided by 2 C alkaline batteries which allow for up to 400 hours of runtime. The Pro20 is backed by a 3 year instrument warranty and a 2 year cable warranty.

Pro20 Features

  • Quickly changes from field to lab work with interchangeable cables and probes
  • Fast response times (95% in < 8 seconds)
  • Internal barometer for automatic barometric pressure compensation
  • One touch calibration
  • Memory for 50 data sets
  • Display and keypad are backlit
  • Highly visible, graphic, LCD display
  • Can operate in multiple languages

What to Order

YSI Pro20 DO meters consist of the instrument, cable, and probe, all purchased seperately. This allows you to choose a configuration suitable for your application, and to order multiple cables/probes to create a versatile instrument that can be reconfigured by simply changing cables.

To order the Pro20 choose the instrument, a cable, and a DO probe (the BOD lab cable includes the probe). Accessories like carrying cases, flow cells, and replacement DO membrane kits are also available

YSI Pro20 Complete Kit

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Part No. Description Price


YSI Pro201
Temp Port
BOD Port
DO Probe
Flow Cell

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YSI Pro20 Instrument Only

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Part No. Description Price
6050020 Pro201 instrument only2 $560.00 $532.00

YSI Pro20 Cable Assemblies

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Part No. Description Price
60520-1 Cable assembly for Pro2012, 1 meter $250.00 $237.50
60520-4 Cable assembly for Pro2012, 4 meters3 $265.00 $251.75
60520-10 Cable assembly for Pro2012, 10 meters3 $315.00 $299.25
60520-20 Cable assembly for Pro2012, 20 meters3 $375.00 $356.25
60520-30 Cable assembly for Pro2012, 30 meters3 $475.00 $451.25
60520-100 Cable assembly for Pro2012, 100 meters3 $750.00 $712.50
605780 Cable assembly for Pro20 with self stirring BOD probe, 2 meter $695.00 $660.25

YSI Pro20 DO Probes

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Part No. Description Price
605202 DO probe1 for Pro20, galvanic $180.00 $171.00
605203 DO probe2 for Pro20, polarographic $180.00 $171.00

YSI Pro20 Replacement DO Probe Membranes

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Part No. Description Price
605913 Replacement membranes1 for Pro20 galvanic probe
Yellow cap 1.25 Mil Polyethylene
$60.00 $57.00
605914 Replacement membranes1 for Pro20 galvanic probe
Blue cap 2.00 Mil Polyethylene
$60.00 $57.00
605306 Replacement membranes1 for Pro20 polarographic probe
Yellow cap 1.25 Mil Polyethylene
$60.00 $57.00
605307 Replacement membranes1 for Pro20 polarographic probe
Blue cap 2.00 Mil Polyethylene
$60.00 $57.00

YSI Pro20 Accessories

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Part No. Description Price
603077 Flow cell kit for Pro20 $375.00 $356.25
603075 Carrying case for Pro20, soft sided $125.00 $118.75
603074 Carrying case for Pro20, hard sided $280.00 $266.00
603070 Shoulder strap for Pro20 $31.00 $29.45
603069 Belt clip for Pro20 $27.00 $25.65
063517 Ultra clamp1 for Pro20 $25.00 $23.75
063507 Tripod2 for Pro20 $30.00 $28.50
605978 Cable weight for Pro20, 4.9 oz $27.00 $25.65
063019 Cable weight for Pro20, 3″, 24 oz $155.00 $147.25
063020 Cable weight for Pro20, 6″, 51 oz $190.00 $180.50

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