Thermograph is a meteorological weather instrument that is used for recording temperature. Digital recording thermometers used for measuring temperature in the marine environments are known as Thermograph. Thermographs are usually attached to the computer set ups. The recorded parameters for operation and download are displayed in both graphic and numeric format on a Thermograph.

The Thermographs are used for monitoring junction temperature of the G3 or G4 processor. It records the minimum and maximum temperatures and simultaneously a small temperature graph displays the past temperature records. In multi-processor models Thermographs can also display processor temperatures individually.

Currently there are two types of Thermographs being widely used:

Under water housings are the places where these units are normally placed. They are attached to the lower portions or suspended in the water column for consumption.