In an advantageous form of construction, the dial has at least one magnet, which by {HEAD ~ rotation} of {TAIL ~ the dial} is guidable along the sensors realized in the form of field probes 
of
In an advantageous form of construction , the dial has at least one magnet , which by { HEAD ~ rotation } of { TAIL ~ the dial } is guidable along the sensors realized in the form of field probes
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH