The movement of the stem in the axial direction is detected by a first switch means, and {HEAD ~ the rotation} of {TAIL ~ the stem} at the second and third positions is detected by a second switch means, whereby any one of the four display items is corrected depending upon the state of the two switch means 
The movement of the stem in the axial direction is detected by a first switch means , and { HEAD ~ the rotation } of { TAIL ~ the stem } at the second and third positions is detected by a second switch means , whereby any one of the four display items is corrected depending upon the state of the two switch means
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH