Amazon.com: Crystal Oscillator Frequency Counter Tester Meter, DIY 1Hz-50MHz Frequency Indicator Crystal Oscillator Tester Module Kit with 5 Digits Digital Tube Display Red : Industrial & Scientific
SMD2016 SMD2.0*1.6 Surface Mount 19.2MHz 32MHz 40MHz 48MHz 50MHz 54MHz 18PF at Cut Quartz Unit Crystal Resonator - China Quartz Crystal and Quartz Resonator
The Crystal (Testing) Method | Hackaday
50MHz_SSB-CW_Transceiver
GSF-75 50R9B | 50MHz 4 pole crystal filter with 9.0kHz 3dB bandwidth | Golledge