The Folding Pocket Magnifiers are available in a wide range of powers from 3x to 20x with several styles offering two or three lenses providing varying focal lengths and magnification powers.
By combining lenses, three different powers are available with the two-lens models and seven different powers with the three-lens models. The glass lenses used in all folding pocket magnifiers provide durability for long life.
The durable plastic swing-away case not only provides a protective cover for the lenses, but serves as a handle as well.
This single lens folding pocket magnifier has 4x power, a 2.5" Focal Distance, and a 36.0 mm lens diameter.
The beam has a fairly narrow focus and unlike a traditional blacklight, most of the light produced by the UV Photon is just outside the visible spectrum (370 nm). In full darkness it will cause objects to fluoresce at distances of 20 feet or more. In bright daylight the effectiveness is greatly reduced, but is still usable at about 6-12 inches.
Here are minerals from the United States, including mines in New Jersey, New York, Arizona, and California as well as beautiful and unusual minerals from Canada, Mexico, Greenland, Italy, Sweden, and other places. Included are values, a comprehensive resources section, plus helpful advice on caring for, collecting, and displaying minerals. The field of collecting fluorescent minerals is relatively new and this is one of the most complete references available.
The Deluxe Moh's Hardness Pick Set now comes in two case types. The wooden case is small enough to carry and the top screws into the base to make a perfect desk stand. The plastic case is longer but the thinner size makes it easier to carry in your field tool set.Hardness is an important and quantifiable physical characteristic of a mineral and in your effort to identify an unknown mineral, the hardness, if known, combined with other properties, can narrow your search to just a handful of possibilities. Simply scratch a smooth surface of your unknown mineral with the picks of various indicated hardness. As an example, if a No. 5 pick scratches the mineral, but a No. 4 pick does not, then your mineral hardness is 4.5. Then compare this against a table of minerals listing hardness values to aid in identifying the unknown mineral.
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