World's Coolest Rain Gauge Extra Tube by Worlds Coolest Rain Gauge. $13.50. Get The Original Pop-Up Rain Gauge. Polycarbonate replacement tube for the World's Coolest Rain Gauge. This tube is for the World's Coolest Rain Gauge only!. Made in USA. Replacement tube for the World's Coolest Rain Gauge. Unbreakable polycarbonate in a highly visible, bright blue color. This tube only works in the World's Coolest Rain Gauge. It is not a stand-alone product. School Kids, Pop Up, It Works, Tube, Bright, The Originals