Hello, my phone is an HTC One M8, and like my HTC One M7 before it, its NFC antenna is around the camera lens, so yeah, I’m sure I’m getting the sweetspot correctly. I also have extremely short range read issues when using various NFC modules on Wemos D1 mini and Arduino projects, hence my interest in trying to enable the strong modulation mode that most other folks seem to have, on my implant. If nothing else to see if the read range can be improved even slightly, because the thing is almost useless at the moment.
I don’t have the field strength tester I’m afraid.