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A thermocline (also known as the thermal layer or the metalimnion in lakes) is a thin but distinct layer in a large body of fluid (e.g. water, such as an ocean or lake, or air, such as an atmosphere) in which temperature changes more rapidly with depth than it does in the layers above or below.
The thermocouple is an electric circuit made by joining wires of two different metals together forming a high-temperature thermometer that is able to determine temperature based on voltage (thermoelectric power) by utilizing the phenomenon of voltage being produced when there is a difference in the temperature of the joint and the base.