Wet and Dry Thermometer - Masons
Wall mounted comprising two thermometer tubes with double scale calibration. Red alcohol filled for easy readability.
Two thermometer tubes with double scale calibration -15 to 120 x 2°F and -10 to 50 x 1°C. One thermometer has bulb wrapped with a wick dipped into a water cistern to keep it wet. Humidity reading got by comparing readings of the two thermometers with a humidity chart. Red alcohol filled for easy readability. With humidity and temperature conversion chart.