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With light: very large folding "Linen Tester" magnifier, lens size 2.5X90

With light: very large folding

Ref: JAN-FD90-L


Including VAT
QuantityPrice per item
4 or fewer items 7.50
5 to 9 items 7.14
10 or more items 6.36



An unusually large 'linen tester' magnifier, with the advantage that it has a light (takes standard AA-size batteries).

Limited quantity (see above for the quantity in stock) - once these are gone, there are no more.

Read all about magnification and how to choose a magnifier, click here.

We have a calculator that shows you the working distance for any magnification, or the magnification for any working distance (Excel format), click here.

This is a very low value item. We have a minimum order charge of 5.00 (4.17 + VAT). Is this the only item you require? You may wish to buy more than one, or add some other items to the order.


Type: Folding (linen tester)

Magnification / lens size in mm: 2X90

Lens material: plastic,

Lens type: Single lens


- top (the bit with the lens) - 96mm X 96mm
- lens (the circle in the top that is the actual lens) - officially 90mm dia though the visible lens is a bit smaller
- height (from lens to object) - 132mm
- base (the bit that rests on the object): - 97mm X 96mm
- folded 35mm high; 96mm wide; 134mm deep

Power: 4 AA-size batteries

Origin / brand: China

Casing: plastic

Finish: matt black

Presentation / extras: cardboard box

{Applications / quality}

A linen tester (also known as a linen prover) is a folding magnifier, traditionally used for measuring the threads-per-inch on linen, which is why it has a scale marked around the base. Today, they are mostly used for viewing stamps, coins, prints and photos - anything flat. They come in all sizes from 15mm to 90mm, one even has a light.

Specifically, a good option as a rest-on-page magnifier for reading text, and the light makes all the difference for reading, a good 'cheap' option as a magnifier for the partially-sighted (the specialist magnifiers cost between £50.00 and £80.00). It is also large enough to work under, e.g. for small jewellery repairs, a good choice if you're carrying it around and need it to fold up compactly - however, the lens cannot be 'tilted' so if space is not at a premium, it would be better to buy a "small stand magnifier".

{Further information}

Everything you need to know about magnifiers and magnification.

See information about (and reviews of) loupes (small high-power folding jewellers' magnifiers).

See information about (and reviews of) binocular (head-worn) magnifiers- especially the surgeons-type.

See a guide to magnifiers for the partially-sighted.

See loupes with UV lights.

Video (electronic) magnifiers, video magnifiers compared.

Products: see pocket microscopes and phone microscopes, click here.

With most magnifiers* magnification and working distance are related. Download our Excel sheet, enter a magnification to see the resulting working distance, enter a working distance to see the resulting magnification.
* excluding surgeons-type, digital & phone magnifiers, and microscopes.