Materials needed include a transparent plastic hose, about
6 m long and 1–1.2 cm in diameter; two transparent acrylic
tubes about 1.2–1.5 m long and about 1–1.2 cm in diameter;
two graduated poles about 1.2–1.5 m long; plastic cable ties;
5 m of nylon string; and two plastic elbows (90) with adequate
diameter to fit the acrylic tubes and the hose.