Comparing Kestrel 3000 Handheld Weather Meter Measurements of Temperature and Relative Humidity against those of the WEKSLER Sling Psychrometer (Model# 315-1)
Relative humidity affects surveying instruments whose observations depend on optical or electromagnetic waves. A handheld digital weather meter is among the simplest and most convenient instruments to measure temperature and relative humidity compared with analog thermometers and sling psychrometers. Temperatures and relative humidities were collected using a Kestrel 3000, a digital handheld weather station, and a sling psychrometer and compared with a linear regression. The slope of the regression revealed that temperatures from the sling psychrometer increase 1.017 °C (p <<0.05) when the Kestrel indicates a temperature increase of 1 °C. Ideally, the intercept should not be statistically different from zero, but the intercept was 20.565 °C (p <<0.05). However, this difference is smaller than the temperature accuracy of Kestrel (±1 °C), so it is within the instrument's design specifications. Relative humidity from the sling psychrometer increases 1.003 percent when the Kestrel indicates a relative humidity increase of 1 percent. The p-value of the intercept for relative-humidity model is not significant (p = 0.92), which indicates that there is no measurement relative humidity bias for the Kestrel compared with the sling psychrometer. Our results show that a digital handheld weather station, such as Kestrel 3000, will be acceptable for surveying procedures.
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