The checking is done very carefully and sufficient pressure must be held on the detector tips to get an accurate reading. This requires considerable skill with attention paid to holding an even pressure at the base of the skull just as the detectors glide over the occiput.
Established patients coming in for a check-up are readjusted only when the original graph pattern recurs.
Also in 1974, Dr. Zimmerman began to design a new handle and case for the Differential Temperature pickup. After several months of working with a master craftsman, a new shape of pickup evolved which is much simpler and less cumbersome to apply to the patient's neck. Therefore, accurate readings are more easily obtained. If the patient is new, and the Differential Temperature Recorder pattern shows a break of two points or more, a set of x-rays is taken in the manner previously described.