For harsh industrial environments, surface acoustic wave (SAW) sensors are attractive because they are fully passive, can sense many physical and chemical parameters and can be remotely queried. In a delay line (DL) configuration, an ID code can be added in the time domain signal, hence the name SAW-RFID or SAW-Tag. In this communication, we showcase recent original examples of SAW RFID sensors for harsh environment temperature and strain sensing, based on innovative electrodes and substrates.