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Very large folding "Linen Tester" magnifier, lens size 2.5X90

Very large folding

Ref: JAN-FD90


Including VAT
QuantityPrice per item
4 or fewer items 5.50
5 or more items 4.68



An extraordinarily large 'linen tester", obviously not for extraordinarily large sheets of linen, people like these simply because they fold up quite small and open out on a stand.

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.

This is a very low value item. We have a minimum order charge of 7.50 (6.25 + VAT). Is this the only item you require? You may wish to buy more than one, or add some other items to the order.

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

Type: folding (linen tester)

Magnification / lens size in mm: 2.5X90

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

Graduations around the base 60mm/1mm and also 2 1/4in/ 1/4in

Origin / brand: China

Casing: plastic

Finish: matt black

Presentation / extras: cardboard box


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 nice cheap option as a rest-on-page magnifier for reading text, the lens is set at just the right distance and is quite large. 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 info.}

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.

{Bulk Discounts}

Our returns policy (return any item you don't like, within 14 days) still applies, but if you return just some of a bulk order, and what you keep doesn't entitle you to the bulk discount, we will allow for this when issuing the refund / alternative items. Confused? - then please email first!

When returning bulk-discount items, if you request alternative items, postage is chargeable.