The GG3 has a slot for the chip address so no magnets are applied. Also, there is not any need to use a multimeter to look for continuity because you have the probe wire build within the GG3 and green indicator led. The underside of the Ghost Gunner 3 is https://ghostgunner301223.techionblog.com/32951980/the-2-minute-rule-for-ghost-gunner-for-sale