Feature:
New concentration rack with ball bearing
Coaxial coarse and high quality focusing
Diameter of annular ring retaining microscope head: 76mm
Diameter of opening for stand publish (arbor): 25 mm/32 mm
Working stroke: 50mm
Center distance: 156mm
One scale of fine focusing: 0 mm
Rotate one circle to upward push or fall: zero
Suit For Microscope: zoom excessive strength electronic microscope