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The Keller Series 21 D RFID pressure transponder / data logger combines a piezo resistive pressure sensor with RFID technology to allow wireless reading and collection of pressure measurements, and in the DC version, downloading of logged data. The standard RFID unit is self powered. The DC, data logging version has a small internal battery which can power the device for up to 5 years assuming a measurement rate of 1 reading per minute. A range of RFID reader units and software is available for these devices. Measurement ranges available are from 0-3 to 0-1000 Bar, with a total error band of 0.5% between 0-50°C.