Estimates of water potential with thermocouple psychrometers are subject to errors due to temperature gradients. The objective here is to describe the design and construction procedures of a new screen‐cage single‐junction psychrometer that minimize these errors. The screen‐cage design restricts entry of contaminants into the psychrometer cavity; allows rapid vapor equilibration between the sample and the psychrometer; and provides a 360° concentric evaporation surface that reduces the influence of vapor condensation due to temperature gradients. In addition, a calibration chamber that can also be used for plant and soil samples is described.
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Brown et al. (1980) studied this question.
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