founded in 1964 by dr. warren e. bulman, ohio semitronics, inc. has been repeatedly recognized as leaders in the field of industrial electrical and energy measurement. dr. bulman pioneered the development of hall-effect semiconductor materials that revolutionized current measurement devices. for the last 40 years, ohio semitronics, inc. has developed and manufactured the widest array of electrical and energy measurement devices available from any single supplier. in addition to our catalog products, ohio semitronics, inc. consistently designs and delivers innovative, customer specific solutions to a wide variety of clients in the field of electrical measuring and control technology. proximity to our customers through the use of local sales representatives, backed by highly experienced factory sales engineers allows us to react quickly to the needs of our customers providing a decisive advantage for professional users of our equipment.*