The Germanow-Simon Corporation was founded in 1916 in Rochester, NY. Starting as a small machine shop, the company quickly grew to become a major supplier of replacement watch crystals made of plastic. During the 1930s G-S purchased Tel-Tru Manufacturing Company and developed this division to become a leading supplier of bimetal thermometers.

Today Tel-Tru Manufacturing Company manufactures and distributes bimetal thermometers, digital thermometers, temperature and pressure transmitters, pressure gauges, and accessory products, that sense and monitor temperature and pressure in sanitary, industrial, OEM, HVAC, and food service processes and equipment worldwide. We have established a reputation for producing thermometers that are the WORLD STANDARD for quality workmanship and accuracy. Our focus today, as it was in 1916, is to meet customers' requirements with quality products, leading technology, and responsive service.