Cole-parmer 7520-40 calibration

[bluegrassreefguy]

I recently purchased a used 7520-40 unit and I feel that it needs to be calibrated

I looked up the manual and I have no clue to what it's asking me to do any insight on this would be greatly appreciated

This unit is supposed to range from 6-600 rpm but it will not slow down that much at its slowest it probably turns 15-18 times per minute

It could also use a new adjustment knob