MSP430F413: Code to test different input level and give the same readout

Part Number:MSP430F413

I have a test probe that reads the conductivity of a solution and have written a code

to read the conductivity and display on the LCD.

The probe needs to be calibrated to a 5 ppt level every time it is used.

I have encountered that after measuring about 20 probes, every probe will give a different

readout of say 5.0ppt, 5.2 ppt, 6 ppt as a example.

Is there a code that can adjust the input read for the different probes to read about the same

for the same solution used.