RFID Module and Oscilloscope
$2 for 10 PCBs & 24 Hour Production: https://jlcpcb.com
This little 125kHz RFID reader puts out a repeating frame of serial data when a card or fob is moved near the antenna. Here I try to decode that serial data using my oscilloscope.
https://www.itead.cc/wiki/RDM6300#Useful_Links