This instrument, known as a polymeter, measures temperature, humidity, vapour tension and dew point.A mercury filled glass thermometer is attached.The humidity element is a bundle of human hair.The dial which indicates selective humidity is 80 mmø.Temperature range –20 to 50oC in 1o div. and Humidity scale 0 to 100 % 0.18 kgs in weight.263 mm in length.
This instrument, known as a polymeter, measures temperature, humidity, vapour tension and dew point.A mercury filled glass thermometer is attached.The humidity element is a bundle of human hair.The dial which indicates selective humidity is 80 mmø.Temperature range –20 to 50oC in 1o div. and Humidity scale 0 to 100 % 0.18 kgs in weight.263 mm in length.