Used with no problems. The next two I took out literally blew apart in my hands as I brought them to the tire's valve stem. On one of them I found a spring about 20 feet from where it self-destructed. Yes, it looks like a good deal, but it's actually very poor quality. I suspect that even if I seal the ends of the remaining ones with epoxy, they probably won't be accurate. Try a different manufacturer. I will reorder from another source. In favor of Revain, they promptly refunded my money to cover my backorder.