Metal reader with powerful or minus lens ( each 0.25 per digree)
( diopter from: + 1.00 to + 4.00 ) or ( from -1.00 to -4.00)
power distance: 63 + / - 1 mm

Metal reader with powerful or minus lens ( each 0.25 per digree)
( diopter from: + 1.00 to + 4.00 ) or ( from -1.00 to -4.00)
power distance: 63 + / - 1 mm

Metal reader with powerful or minus lens ( each 0.25 per digree)
( diopter from: + 1.00 to + 4.00 ) or ( from -1.00 to -4.00)
power distance: 63 + / - 1 mm

Metal reader with powerful or minus lens ( each 0.25 per digree)
( diopter from: + 1.00 to + 4.00 ) or ( from -1.00 to -4.00)
power distance: 63 + / - 1 mm

semi metal reader with powerful lens.
( power distance: 63 + / - 1mm)

metal reader with powerful lens
( diopter: from + 1.00 to + 4.00)
each diopter 0.25 per degree
distance: 63+ / - 1.00mm