Hey HAM,I was told they show you slides of an ro2,Teletector,and a ro2a.Then they show you what scale it is on and the meter reading. Then you put down what it reads. Thats sorry if thats the case. If I was told this incorrectly please correct me,MY BAD IF IM WRONG. I mean there are some SR HP'S out there who i've seen couldn't get a job as a spell checker in an M & M FACTORY ,and still seem to get jobs