* Ensure thermometer is in the water and not touching any surface
* Adjust the temperature to match a known reference, such as an ice bath or boiling hot water
* Wait for 10 minutes to allow for accurate readings
* Compare calibration temperature with actual pool temperature and adjust accordingly.
To calibrate a pool thermometer, ensure it is immersed in the water and not touching any surfaces. Set the thermometer to a known reference such as an ice bath or boiling hot water; wait 10 minutes for accurate readings then compare calibration temperature against actual pool temperature and make adjustments if necessary.