Wall mounted, comprising of two thermometer tubes with double scale calibration. 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.
Wall mounted, comprising of two thermometer tubes with double scale calibration. 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.