HYGRO-FENIX-RM is an EPC Class-1 Generation-2 (C1G2) RFID tag based on Farsens'batteryless sensor technology. Built in a compact PCB format, the tag includes an ambient temperature and relative humidity sensor. These RFID sensor tags are compatible with commercial UHF RFID readers (EPC C1G2). With a 2W ERP setup the battery-less resistance meter can communicate to over 5 meters - 16 feet. The HYGRO-FENIX-RM can be customized with different antenna design and sizes, depending on the specific application. It can be encapsulated in an IP67 or IP68 casing for usage in harsh environments. It may also be possible to customize the specifications of the sensor upon request.