I’ll try my best.
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You can give it a go but you’re likely not to have it work. Quite a few people here have tried and failed to get a reading in the metal needle. As long as you keep it covered and sterile, I don’t see the harm in trying anyways but don’t expect it to work.
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Check this out: xG3 Biomagnet -- suggested locations - #93 by Greyghost
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If you give the terms “spark Projects” a search you should find some. I don’t have one myself. You might find some on the vivokey forum also since it’s a spark.
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I can’t help with the android but for the easiest method of unlocking the pc something like the kbr1 would get you going. It simply acts as a keyboard and types out your ID from you NFC chip and presses enter. https://dangerousthings.com/product/kbr1/
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You can definitely double up on them. You could use your NExT to unlock your pc and phone. It’s spitting out it’s ID number. There’s no pairing like Bluetooth. You just need to set up each device to accept that number as a password and your good.