Hygrometer Wet and Dry Bulb Hygrometer (Mason’s Type) Zeal England

This Zeal England Mason’s-type hygrometer uses wet- and dry-bulb thermometer readings to determine relative humidity with a suitable humidity table or psychrometric chart. It provides a hands-on instrument for environmental observations and laboratory teaching.

Compare the two temperature readings during an observation, then use the appropriate reference table to obtain humidity rather than reading a direct digital percentage.

Product details

• Listed brand: Zeal England.
• Type: Mason’s wet- and dry-bulb hygrometer.
• Design: two thermometers mounted on a frame.
• Wet-bulb arrangement: wick and water reservoir, as listed.
• Wall-mountable frame, as listed.

Measurement principle

The dry bulb measures ambient temperature. Evaporation from the moistened wet-bulb wick produces a temperature difference used to derive relative humidity. Follow the manufacturer's placement, airflow and reading instructions and use a table appropriate to the instrument and conditions.

Applications

Laboratory practicals, greenhouse observations, meteorological studies and routine environmental monitoring where the instrument's documented specifications meet the task.

Specifications to confirm

The earlier listing describes a typical -10°C to +50°C range and spirit-filled, mercury-free thermometers, but exact model specifications are not supplied. Confirm temperature range, scale divisions, thermometer filling, accuracy and country of manufacture from the supplied model documentation. A humidity table and calibration certificate are not specified as included.

Care

Maintain the wick and reservoir according to the manufacturer's instructions, use the specified water quality and protect the thermometers from impact. Keep the instrument away from conditions that could distort environmental readings.