On the display unit select "inputs" button. Select the module that your ph and orp are connected to. Select the probe you want to calibrate and then select calibrate. The orp is a single point calibration. So select calibration and set the target number using the up and down arrows. Once the target number is selected (what the calibration solution is made to) select enter and the "raw data" will flash. Put the probe in the calibration fluid and wait for the raw data number to stabilize. Once the raw data number hasn't changed for about a minute press enter and the calibration is completed.
For a two point calibration (ph probe) have a cup of ro/di water on hand to rinse the probe between solutions. Select your ph probe and select calibrate. The first target data us your low end ph (7.0) set the target to 7.0 and press enter so the raw data number is flashing. Set the ph probe into the calibration fluid. Wait for the raw data to stabilize and select enter. Take the probe out and rinse it in water. At this point itll be asking you for an second target value. Make this 10, and select enter so raw data is flashing, place the probe in the 10 ph solution. Wait for the raw data to stabilize and press enter. And you should be all done.
Long winded but I hope this helps
