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Sheet Protectors
For 8-1/2" x 11" paper. A good close fit, each page protector is three-hole punched (for paper that's already three-hole punched) and has spiral binder holes. Clear 2.5 ml thick plastic.
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36025 SHEET PROTECTOR |
The Mother Of All Fresnel Lenses
It came from either outer space, or a projection TV. Our largest Fresnel lens measures 49-1/8" x 37-1/8" x 1/16" thick, with a 42" focal length. Build your own lighthouse or projection TV, teach optical properties to students, or just turn your 21-inch model into one with a tavern-size picture. Held in the sun, the lens will concentrate rays enough to cook eggs or torch lumber. And, under adult supervision in the parking lot, employees of a certain un-named scientific and surplus purveyor actually melted pennies in seconds. Extremely cool and done strictly, we assure you, to determine the lens's focal length. Do not, we shouldn't have to remind you, store this puppy in direct sunlight. Or let the underage or under-mature sneak it into the sunlight.
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37930 HUGE FRESNEL LENS Note: This item is not eligible for Expedited Shipping or delivery to Alaska, Hawaii, or the Territories. |
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RFID-Blocker Sheet
Saves you from info-snatching electronic pickpockets, and from leaning against the gas pump and emptying your bank account. (The downside of Radio Frequency IDentification.) Called the "EMvelope," it's an 8-3/8" x 3-1/2" x .012" thick trim-able electromagnetic sheet (think Faraday cage with a floating ground) that blocks radio frequencies up to 2.4GHz. Cut it to size and slip it in your wallet, or wherever, and protect the data on your credit cards, "fast-pay" devices, ID cards, EZ-Pass, or anything else with an embedded RFID chip, including the new U.S. passports.
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93390 RFID ENVELOPE |
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