Use linen testers to see linen thread count & check the quality of woven fabrics or use a linen tester to measure the line width and check the registration of colour separations in the field of printing and publishing.
Extremely handy 4x illuminated linen tester magnifying glass for those precision measurements.
Linen Tester 4X power Illuminated. 90mm lens. Built in measure.
Hand Round 130mm 2.5X 






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