The K-type thermocouple is probably the most common type. its low cost and relatively good accuracy together with a wide temperature range make it a versatile sensor. They are suitable for continuous exposure to temperatures around 1,100C, with a max temp of 1,372C (-328F to 2,501F).Different thermocouple types utilize various metals for their positive and negative wires. K-type thermocouples are nickel-based, and therefore also have good resistance to corrosion. This makes them suitable for use in oxidizing atmospheres. K-type thermocouples utilize  Chromel, Nickel-Chromium (10% chromium) for the Positive leg. The Negative leg is Alumel, Nickel-Aluminium (5% aluminum). The accuracy of a K-type Thermocouple is typically a maximum of +/- 2.2C or +/- 0.75%, whichever is greater. However, there can be differences between different thermocouples, even those coming from the same production batch due to deviations in the alloys. It is therefore recommended that thermocouples undergo individual calibration.K-type thermocouples are found in use for many industries such as water, chemical and gas, and food industries. They are one of the more inexpensive thermocouples with good resistance to oxidization, good linearity of measurement, and stability.