Single Item Test   After the Red Cursor is alligned with the Main Frequency (F) (as shown in the graph on the left below). NOTE: It doesn't have to be exactly aligned with (F). Anywhere in the close vacinity is fine. Two cases are possible: 1) The YM reading is in the expected range 2) The YM reading is not in the expected range Do another ascertaining tap to regenerate Main Freq (F) again by: Turning the Sensor ON <Esc>, Tap Again This takes you back to STEP 7