In the UK a jewellers loupe is a round magnifier, about an inch diameter and
about the same in depth, that you clamp (using your eye socket muscles) into
your eye socket. You move the object you are examining closer or further
away from the lens to get it in focus. It's usually used by jewellers to
examine gem stones and precious metal hallmarks. If you watch any of the
antiques programmes on TV, there's usually one of the experts using one.
A linen tester is placed directly onto a piece of fabric, or anything else
that's flat that you want to examine. The type that folds up usually has a
scale on the part that rests on fabric below the lens to enable you to count
the number of threads per inch/centimetre. There are also similar lenses
which are raised above the object you are looking at either by legs on by a
rim, which don't have a scale, but which still sit on the object you are
examining.
Jean in Poole, Dorset, UK
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