This copper gauge lets you see Archimedes' Principle in action every time it rains.

The upward buoyant force exerted on anything immersed in fluid is equal to the weight of the fluid that the object displaces. That's why boats float—and why the tube in this rain gauge rises as its base fills with water.

Known as a pluviometer to science types (the ones who might enjoy hearing this Archimedes stuff), it's available in a patio-ready tabletop version or on a garden stake.

Made in New Paltz, New York.