I've offered to bring an extra detector, too. Usually if it comes up in the course of conversation ("Ya know, I've always wanted to try that!") I'll offer to show them how to use it. They're not always interested in it, but it helps break the ice. After I've gotten permission, I've also brought cookies, home made apple butter, etc. to keep the permission, helped with minor chores/picked up litter, etc. If there's a property I'd to detect on, I usually try to wait till I see someone outside working, but that's just me. That's how I prefer to be approached, so that's the way I do it for others. Good luck! Curt