Inexpensive apparatus demonstrates the divisibility of water into oxygen and hydrogen gas as effectively as more expensive apparatuses. Consists of a 3 in. dia. x 2-1/2 in. H plastic container with mounted carbon electrodes. The container bottom has cutouts, so leads can be easily connected to the electrodes. Total height: 3-3/4 in. Includes two alligator clips (one red, one black) and two graduated test tubes. Works on 12V DC.