E Instruments proudly leads in innovation in its industry, employing some of the best designers, manufacturers, technicians, and analysts in combustion analysis and emissions monitoring and equipment technologies. Recognized both nationally and internationally, the company provides a full range of services to specialists in the HVAC, power, process, industrial, institutional, and IAQ markets. At their facility in Langhorne, Pennsylvania, the company's professionals design, manufacturer and calibrate the latest and most accurate air quality and combustion analyzers available today. Among their latest and most accurate offerings are the BTU 700 and BTU 1500.