This model has a .875 inch diameter glass lens, and is excellent for linen thread count;This stand up folding magnifier offers 8X power magnification;Pre-marked measurements on both sides of the base to ensure accuracy;Overall size of this unit is 42mm x43mm x 43mm- folds up very small for storage;This magnifier has superior optics and is of professional quality

• Waltex:: 42mm X 35mm X 43mm Linen Tester Folding Magnifier With 8X Power & Measurement Markings

Waltex:: 42mm X 35mm X 43mm Linen Tester Folding Magnifier With 8X Power & Measurement MarkingsToolUSA