A machine which records temperature and relative humidity. Sometimes called a hygrothermograph. Usually the results are plotted instantaneously on a chart recorder. To be effective thermohygrographs need to be well maintained and frequently calibrated against a standard measuring instrument such as a sling psychrometer. Automatic dataloggers are preferable.

A machine which records temperature and relative humidity. Sometimes called a hygrothermograph. Usually the readings are plotted continuously on a chart recorder. Thermohygrograph must be well maintained and regularly calibrated to be effective. Calibration is frequently made against a standard measuring instrument such as a sling psychrometer. Automatic dataloggers are replacing thermohygrographs and are now the preferred instruments.

See hygrothermograph.