I called Lost & Found at the airport, but they said to call back after 1 PM today because nothing has been turned in from the weekend yet.
I can buy another meter. I might even be able to buy the same model meter as I already have, so my investment in supplies isn't wasted. But I've lost the last few days' entries because I hadn't transfered them to my spreadsheet yet, which is annoying.
At least, if I did drop my meter at OAK, I didn't cause a close-the-airport terrorist-threat-unknown-device alert there. I think I would have heard about that on the news if it had happened.