psychrometer

1. (meteorology) Any of several instruments used to measure the relative humidity of the atmosphere; especially a wet-and-dry-bulb hygrometer.Examples: "1982 July, Ray W. Brown, Dale L. Bartos, A Calibration Model for Screen-caged Peltier Thermocouple Psychrometers, United States Department of Agriculture: Forest Service, Research Paper INT-293, page 2, Gross adjustment of the model using a small number of well controlled calibration measurements would suffice to make the model applicable to any new psychrometer or group of psychrometers."; "2007, N. J. Livingston, G. Clarke Topp, 71: Soil Water Potential, M. R. Carter, E. G. Gregorich (editors), Soil Sampling and Methods of Analysis, 2nd Edition, Canadian Society of Soil Science, Taylor & Francis (CRC Press), page 976, Psychrometers have two main components: the porous cup with its contained sensing and reference junctions and the instrument for generating the electrical current and measuring the psychrometer output."; "2008, Ross Montgomery, Robert McDowall, Fundamentals of HVAC Control Systems, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Elsevier, page 132, An aspirated psychrometer combines low cost with the fundamental measurement principle of wet- and dry-bulb readings."