Below is a list of Type K Thermocouples manufacturers from Mt. Airy, Maryland. Type K thermocouples are the most common and universal type of temperature sensors today. Used for their sensitivity and wide temperature range of -200ºC to 1,350ºC, type K thermocouples are considered general purpose devices because of their many uses in common, everyday applications. They usually have a high sensitivity, about 4/µv/cº. Type K exhibits high thermopower and good resistance to oxidation but remains inexpensive while lasting a long time.