For use with Hastings Triplet Measuring Magnifier (6383D50) Glass, with peripheral metallic coating 6383D60 Scale permits measurements of radii, angles, size and line widths. Graduated from 1/8 to 5/8 inch radii in 1/32 inch radii intervals, from 0° to 90° angles in 1°…

Three lenses, one 17 mm and two 20 mm diameter Magnification range 5X to 20X In folding pocket case