Is there a humidity monitor/tracker that's transportable similar to an Apple Air Tag?

I’m sending a large shipment which is a 10x10x10 foot machine in a crate on a flat bed truck, and I want to make the thing waterproof. To prove that it’s waterproof, I want to put a humidity monitor in it. Ideally, I can tell from a distance what the humidity is inside the machine. Is there such a thing, and if so, what’s the best brand?