Although this product is boxed as a Linen Tester, with its strong magnifier, this pocket sized device is often used to evaluate snow composition. Folding up to be no bigger than 5 x 6 x 2 mm, it has a strong magnifier, measuring scale and a built-in stand. Historically they were, and still are, used to check the quality of woven fabrics (hence the name) but is used in many other applications. https://www.carrmclean.ca/bausch-lomb-linen-tester.html The item being offered is model 81-31-49 N8869 and has: Power: 5x Lens diameter: 1" Focal distance: 2" Rigid plastic case used but in good condition. Note: the seller is in Metchosin; the item is available if the ad is posted