The 5525 Taylor Mason Hygrometer (A.K.A Mason's Hygrometer) is actually a wet and dry bulb Fahrenheit thermometer pair that tells you the temperature and relative humidity in your home or virtually any other indoor or sheltered location where the temperature remains above 32°F. The humidity indication is based on the difference between the wet and dry bulb temperatures. On the 5525 is a Relative Humidity Table that cross-references the dry bulb temperature with the degree difference between the wet and dry bulb thermometers to indicate the humidity. The Relative Humidity Table is metal and pivots out from the left side of the 5525's base for access to the glass reservoir that you fill with water before you use the instrument. The 5525 mounts on a wall or other vertical surface by means of a screw, nail, or hook.

The Taylor 5525 Mason's Hygrometer is environmentally safe because it is spirit-filled and thus contains no mercury. Like all thermometers, it is not to be mounted in direct sunlight or where there is a great deal of reflected light.

Features:

• For use indoors and in sheltered locations above 32°F.
• Functionally designed and easy to use and maintain.
• Wet and dry bulb thermometers indicate Fahrenheit degrees in easy-to-read black-on-white numbers.
• Metal Relative Humidity Table on front of unit cross-references Dry Bulb Temperature with Degrees Difference Between Wet & Dry Bulb to indicate humidity.
• Relative Humidity Table pivots outward from thermometer base for access to wet bulb thermometer's water reservoir.
• Environmentally safe (red spirit-filled thermometers, no mercury).
• No batteries required.

Specifications:

• Thermometer measuring range: 0° to +130°F in 2°F increments
• Dimensions:
   4 inches (102 mm) wide
  10 inches (254 mm) high
  1-1/8 inches (29 mm) deep