Here's a video from Milwaukee Instruments that goes through the calibration process for this unit.
- 1 Point manual calibration
- Range is 0 - 14 pH. Resolution .1 pH.
- Includes protective cap
- Includes calibration screwdriver
- Batteries included
- Instructions included
Milwaukee Instruments PH600AQ Ph Tester With 1 Point Manual Calibration - $20.70 + Free Shipping with $25 order