"Useless magnet" star star star star_border star_border Device seems ok but despite being described as magnetic, it will not stick to a metal surface properly. The magnet is far too weak and the device just slips down the surface... And that is without the extra weight of the probe being inserted! If you want to hang it, or stand on a table, it is fine... Otherwise the magnet is not fit for purpose support_agent A note from the team We offer a 3-year guarantee on every product. It means if you buy anything from us and you're not 100% satisfied, or if you decide it's not for you after all, you have plenty of time to return it for a full refund or replacement.