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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. We are home to the $3 quartz crystal and the $1999 Film Thickness Controller And with our 100% money back guarantee, you can't go wrong!