One-way Screw Thread Loupe with big headband MCS1543

1.Magnification：4.0X
2.Work distance：340mm、420mm、500mm
3.View field:φ50mm~φ80mm
4.Pupil distance:54~68mm
5.Depth of field: standard work distance±30mm
6.Helmet diameter:160~200mm
7.Load weight:235g
8.Package size：325*230*120 mm 9.Package:case
Frame included
Optional: Magnification 5.0X、6.0X