A simple traditional cache at a nature watch hide thing.
I've been struggling to think of places to hide new caches, but I had a brainwave in bed last night and though this would be the perfect place for one. At certain times of the day, muggle activity is high, but was quite low at eleven am when I hid it. Please replce as found, or the explicit hint item will not be accurate.
You are looking for a test tube.