Measurement Specialties, Precision Position Products Operations (formerly JDK Controls, Inc.) is a manufacturer of precision, co-molded conductive plastic potentiometers and contact-less (hall effect) position sensors and......Measurement Specialties, Precision Position Products Operations (formerly JDK Controls, Inc.) is a manufacturer of precision, co-molded conductive plastic potentiometers and contact-less (hall effect) position sensors and transducers. Measurement Specialties has become a world leader in providing solutions where a precision positioning sensor is critical to the customer system. All of Measurement Specialties precision position sensors are designed, manufactured, and tested in accordance to MIL-R-39023 and quality assurance MIL-1-45208A and AS9100 quality standards.