From OpenTHC

The <a href="https://www.metrc.com/">METRC</a> system uses RFID, based on UHF900 specification.

<a href="http://amzn.to/2qH7hGi">RFD8500 Bluetooth Handheld UHF RFID Sled with 2D Imager</a>

Empower select Zebra and compatible third-party mobile devices, tablets, and smart phones with enterprise-class UHF RFID and 2D bar code scanning technology.

<a href="http://amzn.to/2rqeazM">DS9808-R General Purpose RFID Scanner</a>

A desktop model, connects over USB