Profile: Tel-Tru Manufacturing Company manufactures and distributes bimetal thermometers, digital thermometers, temperature & pressure transmitters, pressure gauges & accessory products. Our products are widely used in sanitary, industrial, OEM, HVAC, food service processes and equipment. Our pressure gauges are available in a wide variety of dial sizes, accuracies, pressure ranges, and case configurations, for the various requirements of industrial and process instrumentation.