Optimus Electric Quartz Crystal Oscillator 38MHz for Microprocessor Microcontroller Precision Frequency Timing Time Tracking Clock Signals with Through Hole Mounting Type from Pack of 100: Amazon.de: Gewerbe, Industrie & Wissenschaft
Chunzehui 2048Hz ~ 0.00049Hz(1/2048Hz) Extremely/Super Low Frequency Square Wave Oscillator Module, Square Wave Signal Generator. Total 22 Output Ports, at The Same time can Output 22 Frequencies.: Amazon.com: Industrial & Scientific
Amazon.com: NATIONAL GEOGRAPHIC Rocks & Fossils Kit – 200+ Piece Set Includes Geodes, Real Fossils, Rose Quartz, Jasper, Aventurine & Many More Rocks, Crystals & Gemstones : Toys & Games
Tester für Oszillator mit Quarz, SeaStart50 MHz, Tester für Oszillator mit Quarz, zum Selbermachen, Digitales Display, Rot : Amazon.de: Gewerbe, Industrie & Wissenschaft