YSI Pro1020 pH & Dissolved Oxygen Meter

The YSI Pro1020 provides everything required in a handheld instrument to measure dissolved oxygen, temperature and either pH or ORP.


  • User-replaceable cables and sensors provide versatility
  • Smart calibration routine allows easy calibration routines
  • Graphic backlit display with 50 dataset storage
List Price $998.00
Your Price $948.10
Stock Check Availability  

The YSI Pro1020 provides everything needed in a handheld instrument to measure dissolved oxygen, temperature and either pH or ORP. User-replaceable sensors and cables (sold separately), 50 data set memory, and a convenient calibration routine makes it user-friendly. 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.


  • Available with 1- 4- 10- 20- and 30-m cable lengths standard (cable management kit included on all cables 4-m and longer).
  • 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.
  • Multiple languages: English, Spanish, French, and Portuguese.
  • Choose either polarographic or galvanic DO sensors.
  • Quick response times; 95% DO response time is approximately 8 seconds with the standard membrane (fastest response time in the market).
  • 3-year instrument; 2-year cable; 1-year sensor warranty (6-months Galvanic DO).
  • Cable Lengths: 1- 4- 10- 20- and 30-m lengths (3.28, 13.1, 32.8, 65.6, and 98.4 ft.)
  • Certifications: RoHS, CE, WEEE, IP-67, 1-meter drop test
  • Connector: MS (military spec) waterproof with bayonet lock
  • Data Memory: 50 data sets
  • Dimensions: 8.3 cm width x 21.6 cm length x 5.6 cm depth (3.25 in x 8.5 in x 2.21 in)
  • Languages: English, Spanish, Portuguese, French
  • Power: 2 alkaline C-cells providing approximately 425 hours of battery life depending without backlight usage; low battery indicator with approximately 1 hour left
  • Warranty: 3-year instrument; 2-year cable; 1-year most sensors; 6-month galvanic DO
  • Waterproof: IP67 (even with the battery cover off)
  • Weight with Batteries: 475 grams (1.05 lbs)
  • (1) YSI Pro1020 display
  • (1) Operations manual
  • (2) C-cell batteries
Questions & Answers
Is my meter waterproof?
This meter features a tough, IP67 rated, impact-resistant, waterproof case. It is even waterproof without the battery cover.
Which DO sensor should I use?
The Pro1020 is compatible with the both polarographic and galvanic dissolved oxygen sensors. The galvanic DO sensor offers immediate readings with no warm-up time. The polarographic sensor requires a short warm-up time, but it has a longer usable life than the galvanic DO sensor.
Does the YSI Pro1020 meter measure temperature as well as pH and dissolved oxygen?
Yes, the temperature sensor is integrated with the cable assembly for the YSI Pro1020 meter and is a thermistor style probe, located next to the sensor ports.
Is the YSI Pro1020 pH and dissolved oxygen meter able to calibrate the pH sensor using a 3-point calibration?
Yes. The pH probe can be calibrated using a 1, 2 or 3-point calibration. More information on page 22 of the manual https://www.fondriest.com/pdf/ysi_pro1020_manual.pdf
How often does the YSI Pro1020 meter need to be calibrated?
The pH calibration should be verified every day the instrument is used. However, a new pH sensor may be capable of holding its calibration for several days. The dissolved oxygen sensor should be calibrated every day the instrument is used. The temperature sensor cannot be calibrated nor should calibration be required.
Did you find what you were looking for?

Select Options

  Products 0 Item Selected
Part #
YSI Pro1020 pH & Dissolved Oxygen Meter
Pro1020 pH & dissolved oxygen meter (cable/sensor sold separately)
Check Availability  
  Accessories 0 Item Selected
Notice: At least 1 product is not available to purchase online
Multiple Products

have been added to your cart

There are items in your cart.

Cart Subtotal: $xxx.xx

Go to Checkout

In The News

Watershed groups handing tech to volunteers for better citizen monitoring

Watershed protection groups across the country are collecting water quality data on waterways that might otherwise miss out on monitoring entirely. Some have found that, despite small staffs, they can compile more high-quality data by putting water quality sensors and other professional scientific instruments in the hands of volunteers. For organizations like the Santa Barbara Channelkeeper, the reasoning for equipping volunteers with electronic handheld meters is clear: "We really want the data that we're collecting to be utilized," said Ben Pitterle, director of the group's watershed and marine program.

Read More

Researchers pioneer continuous groundwater quality monitoring in Ontario

As a graduate student in Ontario, Jana Levison manually sampled groundwater wells in a hay field for a week straight. Now an assistant professor in the University of Guelph's School of Engineering, Levison is investigating how a new generation of water quality sensors can move the science forward while cutting the labor back. Levison said her doctoral work in a crystalline bedrock aquifer showed monthly variations in nitrate — a common groundwater contaminant often sourced to intensive agriculture — and daily variations in E. coli. Those short-term changes got her interested in watching groundwater in a more detailed manner. "Now we have the equipment that we can do that," Levison said. That equipment includes YSI's EXO multi-parameter sondes and Satlantic's SUNA nitrate sensor.

Read More

In Sierra Nevada streams, researchers on the lookout for drought-threatened fish

In the parched hills of the Sierra Nevada, researchers are surveying drought-weakened streams to see what effects long-term dryness is having on fish populations in the region. Their findings so far have been less than stellar, with sparse numbers of fish being counted. Still, as data collection is progressing, the researchers, who work out of the University of California, Davis’ Center for Watershed Sciences, are gathering insights that could aid in conservation efforts that are expected to grapple with coming climate changes. The purposes of the investigation are two-fold. “If we ever get rain again, we want to see how well these areas are recovering from drought,” said Rebecca Quinones, a postdoctoral researcher at the center and leader of the project.

Read More