Figure 1. Structure of an RFID.
The magnified radiograph of an RFID device and HydroMark® clip (Mammotone, Cincinnati, Ohio). The chip (yellow arrow) can be seen encased in a glass casing (blue arrow). The total unit measures 9 mm.
The commonly used Gel Mark clip can be seen for comparison of size and appearance (red circle).
RFID: radio-frequency identifier device