Pacific Transducer Corp. is the leading manufacturer Durometers and Surface Thermometers in the world. Our factory is located in Los Angeles California where PTC® has been manufacturing quality instruments since 1946. We ......Pacific Transducer Corp. is the leading manufacturer Durometers and Surface Thermometers in the world. Our factory is located in Los Angeles California where PTC® has been manufacturing quality instruments since 1946. We also manufacture Steel Hardness Testers, Optical Instruments, Polariscopes, and Training Handcuffs. PTC Metrology® and PTC® Instruments are divisions of Pacific Transducer Corp. PTC® Instruments offers a full line of Pressure Gauges, Stem Thermometers, Data Loggers, Digital Thermometers, Chart Recorders and many other industrial measuring devices for temperature, humidity, pressure, strain and hardness.