Do you know where your thermometer is?
Mine has gone missing. It hasn't been used for years and isn't where it belongs or any other place I can think of that it would go (though I just thought of another improbable place to look). You can't actually buy one, and they're all needed for all these checkpoints anyway.
So, looking at the delivery dates in April and May on Amazon, and seeing what else turned up on the search, I realized something. I have a digital combo instant read IR/probe thermometer in the kitchen, plus a meat thermometer. The candy thermometers wouldn't be useful, but the others would do in a pinch. :)