xLED Field Tester

Good visual indicator of reader antenna field strength and best reading orientation

I used this field tester to have a better look at my current reader field strength and realistic read-distance. I want to make a receiver antenna that achieves >1.5cm read distance which is nearly impossible with these implant RFID chips/antennas from what I gather.
Using this tester allows me to test my own antenna designs/matching circuits without the need of extremely expensive analyzer equipment because I get the LED lighting up when the antenna is receiving energy. Hopefully over time I will successfully manage to create the antenna/matching circuit I need, but in the mean time this tool helps me out figuring out what works and what doesn't.

Bottomline: a white LED with the same antenna as the actual xNT or similar RFID implant chips. The LED lights up when it's near a matched RFID field. The stronger the received field, the brighter the LED. Works as advertised.