I’m sorry for not answering earlier. Axzon is still maintaining this forum. It would be easier to give you a recommendation if you provide more details about your application. With RFID Sensors is important to address all the application details. For example, a sensor that it is going to get exposed to water, depending on the amount of water, will change its read distance.
Finally, please remember that for high volume applications it is possible to design a specific sensor that addresses the application needs.
If the RFM2110 tag is installed in a non-metal surface the sensitivity will be affected to such a degree that it might become unreadable. And even if it becomes slightly readable with a high-power reader, the sensor codes, that provide a measurement of moisture, will not operate correctly. For moisture detection in non-metal surfaces Axzon recommends the use of the RFM2121 tag.
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Axzon (formerly RFMicron)
3700 N. Capital of Texas Hwy
Austin, TX 78746
Tel: (512) 535-4647 Axzon.com