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Tangidyne LLC 
Welcome to Tangidyne, your home for Quartz Monitor Crystals, Film Thickness Controllers, Sensor Heads, Cables and Hardware. We invented the Alloy Crystal, the RC Crystal, the Heated Sensor and the Transparent Crystal Our main focus is on low prices. Why should you pay more for technology that costs less? We will meet or beat anyone's price anywhere in the world. And with our 100% money back guarantee, you can't go wrong!