The Uniprobe uses the same coil as the Detectorpro Headhunter Pulse detector. The coil has to be inductance of 1mh and resistance of 10 ohms, which is different than what most other pulse induction detectors use. Your best bet is to watch the forums and eBay for a Headhunter Pulse coil. They do turn up occasionally. You will need to change the coil connector because the Uniprobe uses a different connector than the Headhunter Pulse. You