A linen tester, often referred to as a “thread counter,” is most commonly known for its association with the garment trade. Historically, linen testers were used to count the number of threads within a fixed area of fabric. Linen testers have a measuring scale on their base and they typically fold flat for storage. Today, they are used in the printing industry to see how inks lay on a printed surface. Linen testers are sold in varying magnifications or optical configurations.
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