A privately held corporation of Delaware, DEI is licensed and fully operated from Dayton, Ohio.

DEI began as a spin-off of Yellow Springs Instrument Company (YSI Inc.) in Ohio when DEIís† president, Mr. Elias Aboujaoude, purchased YSIís industrial line of instruments.

DEI was incorporated in the state of Delaware in November 1988. Full operations commenced in the state of Ohio on January 1, 1989.

DEI manufactures a complete line of transmitters, signal conditioners, indicators and data loggers covering several markets such as HVAC control, food processing, petrochemical and chemical processing as well as military, laboratories and research institutions. DEI is always pursuing new design and contract opportunities in support of its customers. These opportunities vary from a simple redesign of a present product to fit customer needs, to opportunities of a complete design of a product or a part of a product dependent on the customerís needs.

Although DEI is not an ISO certified company, its instruments are subject to a strict and thorough quality assurance program set in place by its president, Mr. Elias Aboujaoude.† The employees of DEI stand by their workmanship, and customer satisfaction of each and every product is guaranteed.

To contact us:


Please call

(937) 433-1600

or email us at