What is the scale of measurement on a stevensons screen?

A Stevenson's screen is designed to house meteorological instruments and is typically used to measure temperature and humidity. The scale of measurement for temperature in a Stevenson screen is usually in degrees Celsius or Fahrenheit, while humidity is often measured in percentage (%). The screen itself does not have a scale; instead, it provides a controlled environment for accurate measurements of these variables by shielding instruments from direct sunlight and precipitation.