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To adjust the salinity compensation value:.

1. 

Use the up or down arrow keys to highlight the salinity box on the run screen, 
then press enter.  

2. 

Use the up or down arrow keys to adjust the salinity compensation value to the 
salinity of the water you are testing.  

3. 

Press enter to confirm and to save the new salinity compensation value.

Taking Measurements

The Pro20/Pro20i can be calibrated in 

%

 saturation, 

mg/L

, or 

ppm

.  Calibration of any 

option (%, mg/L, or ppm) will automatically calibrate the others.  The Pro20/Pro20i can 
be calibrated with the press of one key when One Touch Cal is enabled in the System 
Setup menu.  

The following procedure outlines the % saturation calibration option with and without 
One Touch Cal enabled.

1. 

Turn the instrument on and wait 5-15 minutes if using a polarographic sensor.

2. 

To take readings, insert the probe into the sample.  Move the probe in the 
sample at a rate of at least 6 inches per second until the readings stabilize. 

3. 

Highlight 

Save

 and press 

Enter

 to store the reading.  The instrument will 

confirm that the reading was successfully saved.

Visit 

YSI.com/Pro20

 or 

YSI.com/Pro20i

 to 

find the User Manual, specs, and accessories. 

Item# 605645 Dwg# 605645 

January 2020 Rev E 

1725 Brannum Lane
Yellow Springs, OH 45387 
(800) 765-4974,  (937) 767-7241 
[email protected]

Contact Information

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