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This unique rain gauge design is based on Archimedes' principle of water displacement, resulting in a fun and functional instrument unlike any other. The rain gauge is held in a sturdy steel mount that's powder-coated for rust resistance. Just sink the bottom stake into the soil, and you're good to go. The solid flute collects the water, and the extremely durable blue polycarbonate measuring tube with a calibrated float sits down inside the flute. As water fills the flute, the blue tube floats up, displaying the measurement. Specification: Name: Floating Rain Gauge Material:ABS Size: 15.7 x 2 x 2 in / 40 x 5 x 5 cm The solid flute is 1.5" wide (interior diameter) x 6.0" high; The inner blue tube is 1.375" interior diameter x 1.5" outer diameter x 6.0" long. Capacity: the maximum is 5.5 inches. Weight: 450g Package Includes: 1 x ABS Rain Gauge