Weather forecast rain bottleInstructions for use"Water soluble pigments--against some water (currently poor water quality, pure water is recommended)--With a syringe on the sets of plastic pipes, against good color water absorption into a bottle. It takes about three times.--Fastest when it rains, water in slender glass tube rises next to, than glass ball in the horizontal plane to much higher and sunny days, it will fall back to the same level.--Verbose operation can look at the specification of the package.

Weather forecast rain bottle