The RFID Power Mapper from RFMAX is a hand-held, battery-free RFID antenna field meter that accurately maps the signal strength and coverage area of RFID antenna installations. It is an invaluable tool for any RFID professional and can help troubleshoot and optimize any UHF RFID installation. The meter is small and easy to handle on the job site and is specially designed to operate throughout both the ETSI and FCC RFID range: 865-928 Mhz. The meter measures antenna range up to 10 meters / 30 feet, side lobes, back lobes, linear vs. circular polarization effects, null cancellations, etc. The meter operates like an RFID tag, being powered by the radio waves, so it is always ready when you need it.