NM Series Hydrogen Gas Generators. Simple, Safe and Pure. Designed Specifically to Eliminate High Pressure Dangerous Hydrogen Gas Cylinders from the Work Place. Uses only Water and Electricity to Operate. Several Models Available from 100 mL/min to 1,350 mL/min, Gas Purity to +99.99996% with Output Pressure Controlled from 20 psig to 160 psig. Each Unit Complies with UL, CSA, FCC and CE Standards.