Magnification change: Three Position revolving Drum (Standard)
 Five Position revolving Drum (Professional)
Eyepieces:  12.5x
Angle between eyepieces:   13 degree
Total magnification Ratio: 10x, 16x, 25x (Standard)
                                           6x, 10x, 16x, 25x, 40x (Professional)
Pupilary adjustment: 52mm~78mm
Diopter adjustment: ±6D
Field of view:    25x (8.5mm), 16x (13.5mm), 10x (22mm), 6x (34.7mm) Professional

Slit Illumination: 
Slit width: Continuously variable from 0 to 14mm (at 14mm,slit becomes a circle )
Slit length: Continuously variable from 1mm to 14mm
Aperture diameters: 14mm,8mm,3.5mm,0.5mm
Slit angle: 0-180 degree
Filters: thermal safety,Red-free,Cobalt Blue
Lamp: 6V/20W Halogen Lamp