How to measure superheat?
Glad you asked...
Measuring superheat may sound complicated, but once you get the hang of it, you will find it is actually pretty simple. First, you will want to take a couple of readings using your compound gauge.
chickiemomma1961, Shopping Expert
Then again, this answer might help you...
Using superheat instruments is the easiest way to measure superheat. Select the right refrigerant and connect the pressure port on the instrument to the suction line. Now, you can connect the thermocouple clamp to the suction line. The instrument will show that it is superheated.
chamberj, Shopping Expert