US$ 119.00
retaining field strength across years of classroom handling
inches of mercury
and brass strips radiating to the rim
Spring-loaded vinyl jaws open to 2
Optically Worked Double Convex Glass Lens, 75mm Diameter, 300mm Focal Length, Alternate Model Capacity_125mL retaining field strength across yearsAlternate model 75mm double convex glass lens at 300mm focal length, the optically worked surfaces and ground polished edges parallel to the main line 300mm focal lens for backup stock use.