Renewable Energy: PEM Blue Electrolyzer Set of 5Renewable Energy: PEM Blue Electrolyzer Set of 5 Use the PEM Electrolyzer to produce hydrogen and oxygen using only pure water and an external power source. Take your pick of power sources, all available from Horizon: small solar cell, wind turbines, fuel cells, mechanical hand cranks, or batteries. Using the high tech proton exchange membrane, this tiny electrolyzer will produce hydrogen for use in any classroom or laboratory activities. Converts