3M 20967, Portable Utility Cloth Roll 314D, P240 J-weight, 1 in x 20 yd, 7010290604 
Insize ISM-PM40, PORTABLE MEASURING MICROSCOPE, 40X, 6928640371073
$312.49
Total magnification 40X. Eyepiece 10X with graduation.
Objective (achromatic) 4X (numerical aperture: 0.1).
Working distance .71″. Graduation .001″/0.025mm.
Viewing field .18″DIA. Focus range 1.18″DIA.
Illumination LED light. Diameter of base 2.48″DIA
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