Enerac is the leading manufacturer of portable emission and combustion analyzers in the world. 45 years of experience in measuring combustion efficiency and monitoring emissions have given rise to our smallest, most advanced instruments ever. When You Purchase an Enerac Portable Combustion, Emission & Gas Analyzer, You’ll Never Have To Buy Another Replacement Unit Again! We service EVERY product ever made by Enerac and we stand behind our analyzers. The Enerac models 500 and 700 can be tailored to suit your specific needs.