Rosedale Products Inc., of Ann Arbor, Mich., announces the versatile Communicator III. It senses and computes differential pressure from 0-1,000 psi more accurately and efficiently than standard differential pressure gauges or switches. Originally designed for monitoring pressure for filter housings, control engineers will find a variety of applications on any flow of liquid between two points. It continually reads differential pressure using electronic sensors and has no moving parts to wear or clog.