I need to know how to change which reference sphere is associated with the reference tip. I am sending out our spheres one at a time for calibration, which leads me to installing our spare. I have added a new sphere, found the new sphere and even calibrated a tip on it. But when I try to calibrate the reference tip, it is still trying to use the def. calibration sphere. I don't see an option to change reference sphere like I do with other tips. I looked through the help files but didn't see anything like this.