ESC engineers and manufactures source testing equipment that fulfills or surpasses the technical and operational requirements specified by the U.S. EPA for their Stationary Source Testing Methods. Our systems are engineered for reliability, ease of use, and long operating life. We stock standard equipment ready to ship when an order is placed. The ESC products that you receive may differ from catalog or website representations due to design changes and improvements. These alterations in the design are made in response to changes in regulatory requirements or for the purpose of improving performance, prolonging operating life, facilitating replacement of parts, or expediting delivery. ESC regularly reviews the design and function of existing products, based on field use, and modifies it’s existing equipment to better serve our valued clients.