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Easy to use, rugged and reliable, the YSI Pro1020 provides everything you need in a handheld instrument for the measurement of dissolved oxygen, temperature and either pH or ORP. User-replaceable sensors and cables, 50 data set memory, and convenient calibration routine makes it user firendly. A true field instrument: Mil-spec (military spec) connectors, IP67 waterproof, rubber over molded case, and 1-meter drop tests ensure durability to provide years of sampling even in the harshest field conditions.

Pro1020 System Specifications (Instruments, Probe and Cable)
Temperature Range -5% to 55oC (0 to 45oC; DO compesation range for mg/L)
Resolution 0.1oC
Accuracy ± 0.3oC
pH Range 0 to 14 pH units
Resolution 0.01
Accuracy ±0.2
ORP Range -1500 to 1500 mV
Resolution 1 mV
Accuracy ±20 mV
Dissolved Oxygen Range 0 to 500% air saturation
(% saturation) Resolution 0.1% or 1% air saturation (user selectable)
Accuracy 0 to 200% air saturation, ± 2% of the reading or ± 2% air saturation, whicever is greater;
200 to 500% air saturation, ± 6% of the reading
Dissolved Oxygen  Range 0 to 50 mg/L
(mg/L) Resolution 0.01 or 0.1 mg/L (user selectable)
Accuracy 0 to 20 mg/L, ± 2% of the reading or ± 0.2 mg/L, whichever is greater;
20 to 50 mg/L, ± 6% of the reading
Barometer Range 500 to 800 mmHg
(mmHg, inHg, mbars, Psi, Kpa) Resolution 0.1 mmHg
Accuracy ± 5 mmHg within ± 5oC calibration termperature
Pro20 Additional Specifications
Size 8.3 cm width x 21.6 length x 2.3 cm depth (3.25 in. x 8.5 in. x 2.25 in)
Weight with Batteries 475 grams (1.05 lbs)
Power 2 alkaline C-cells providing 400 hours of battery life; low battery indicator on Pro20
Cables* 1- 4- 10- 20- 30- and 100-m lengths (special order up to 100-m)(3.28, 13.1, 32.8, 65.6, 98 ft) 
Salinity Input Range 0-70 ppt; manual (automatically compensates for manual input value)
Data Memory 50 data sets
Languages English, Spanish, German, French
Certifications RoHS, CE, WEEE, IP67 waterproof, 1-meter drop test

Product dimension

L X W X H = (21.6 X 8.3 X 2.3) cm


  • User-replaceable cables and sensors provide versatility, reduce down time and reduce overall cost of ownership.
  • Available with 1- 4- 10- 20- and 30-m cable lengths standard (cable management kit included on all cables 4-m and longer).
  • Smart calibration; the instrument remembers the previous calibration values and simply walks you through the routine (quick DO cal with the push of 2 buttons).
  • Stores 50 data sets; no need to write down data.
  • Large graphic, backlit display and glow in the dark keypad. Usable in any lighting condition. The display is also visible when wearing polarized sunglasses.
  • Tough. IP67, impact-resistant, waterproof case. Waterproof without the battery cover as well.
  • Rubber over molded case provides extra durability. Military spec connectors are unsurpassed for ruggedness.
  • Multiple languages: English, Spanish, French and Pourtugese.
  • Choose either polarographic or galvanic DO sensors.
  • Quick response times; 95% DO response time in approximately 8 seconds with standard membrane (fastest response time in the market).


1 Unit

Product Application

Measure the dissolved oxygen and the acidity level (pH) of water

Expiration date

365 usage time