| Riotronics http://www.riotronics.com/ Manufacturers retrofit meter pulse kits for automatic meter reading systems, energy management, scada, data logging and recording systems. | |
| Rieker Instrument Co., Inc. http://www.riekerinc.com/ Specialize in manufacturing manual inclinometers, electronic inclinometers, accelerometers, and tilt indicators . | |
| RKC Instrument Inc. http://www.rkcinst.com/english/index.html A manufacturer of multi loop and single loop temperature controllers, process controllers, indicators, control systems and level meters as well as temperature sensors, humidity sensors, level sensors, pressure transducers and recorders. | |
| Process System Solutions Ltd http://www.pci-instruments.com/ Manufacture hygienic diaphragm gauges and a range of temperature and pressure instrumentation for the processed food, pharmaceutical and chemical industries. | |
| Process Measurement & Controls, Inc. http://www.pmc1.com/ Manufactures and supplies components for precise and reliable measurement of pressure, level and vacuum on processes involving corrosive, viscous, clogging fluids. | |
| Process Instruments Inc. http://www.ringbalance.com/ Manufactures and supplies repair parts for Hagan Westinghouse product line including power positioners through to ring balance meters. | |
| Princo Instruments, Inc. http://www.princoinstruments.com/ Manufacturer of precision instruments and controls including barometers, density monitors and level control for use in applications in chemical, petrochemical, food, medical, pharmaceutical, water and wastewater treatment, utility industries. | |
| Precision Measurement Company http://www.pmctransducers.com/ Manufactures miniature pressure transducers, extensometers, and miniature load cells. | |
| Prater-Sterling http://www.prater-sterling.com/ Provides manufacturing automation through process controls, specialist weighing systems, bulk handling equipment, human-machine interface, material handling equipment. | |
| Power Technology, Inc. http://www.powertechnology.com/ Designs, manufactures, and distributes laser diode products for OEM analytical, biomedical, and industrial applications. | |
| PZEF Co. http://www.pzef.net/ Provides digital and analog circuit design, printed circuit board layout and system design for instrumentation and control electronics. | |
| PSM Instrumentation Ltd http://www.psm-sensors.co.uk/ Manufacturers and suppliers of level pressure and density transmitters, measurement, monitoring and control equipment. | |
| PRIME Measurement Products, LLC http://www.prime-measurement.com/ A manufacturer of flow, pressure and level measurement solutions for the process and bulk goods industries. | |
| PR Electronics Inc. http://www.prelectronics.com/ Manufacturers a wide range of analogue and digital signal conditioning modules for industrial automation. San Diego, California, USA. | |
| PASI S.r.l. http://www.pasisrl.it/ Manufacturer of seismographs, water indicator level reels, and other geophysics related instruments and software. In Italian and English. | |
| Oxigraf Inc. http://www.oxigraf.com/ Manufacturers of industrial oxygen safety monitors and process controllers, OEM oxygen sensors, transfill oxygen monitors, and oxygen analyzer equipment for medical and cardiopulmonary professionals. | |
| Otek Corp. http://www.otekcorp.com/ Process controllers, bar-graph instruments, digital panel meters, wireless and RF controls. | |
| OCi Controls, Inc. http://www.oci-texas.com/ Manufacturers of process and energy control instruments such as, pressure calibrators, flow computers, totalizers, process controllers, energy computers, transmitters, and custom controls. | |
| O'Keefe Controls Inc http://www.okcc.com/ Designs and manufactures precision control orifices, switches and sensors for temperature, flow and pressure applications. | |
| Novotechnik http://www.novotechnik.com/ Manufactures position sensors, transducers and instrumentation for linear and rotary position measurement and control. Applications include automobiles, medical equipment and plastics manufacturing. | |
