linen tester

English

Etymology

From linen +‎ tester.

Noun

linen tester (plural linen testers)

  1. A folding magnifying glass which, when unfolded, forms a frame for the lens at a pre-focussed distance. Commonly used in stamp collecting.
  2. A small magnifying glass, as might be used to check the thread count of linens.

References

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