Comprised of two identical dual-scale thermometers. Water cistern fitted to the lower case is connected to the "wet bulb", providing the contrasting "Dry" and "Wet" bulb readings. Can be used to determine the water vapor content, or relative humidity, of the air at a given temperature. Wall mounted. Measures 11.5" long
The Mason's Hydrometer, also known as a Wet/Dry Thermometer, is comprised of two identical dual scale thermometers. One thermometer has a dry bulb, while the other bulb is kept wet via connection to a water reservoir. Relative humidity is calculated from the difference in readings of the thermometers. Dual scale ranges: -10 to 50°C; 20 to 120°F. Wall mounted. Measures 11.5 long, 3 wide, and 0.5 thick.
Great for any school or home laboratory.
Analog Plastic Zeal Wet And Dry Bulb Hygrometer, For Lab Use at Rs 890/piece in Coimbatore
CM3505 Masons Wet and Dry Bulb Hygrometer - ClimeMET
Modern Physics — Page 58 — Eisco Labs
Mason Hygrometer, Non-Mercury
Upgraded Wet-Dry Bulb Hygrometer Wall Mounted Thermometers Easy Installation - AliExpress
Modern Physics — Page 29 — Eisco Labs
Wet-Dry Bulb Hygrometer, Wall Mounted Thermometers - Eisco Labs : Patio, Lawn & Garden
Comprised of two identical thermometers. One thermometer has a dry bulb, one thermometer has a wet bulb. Wall mounted. Measures 11.5 long, 3 wide,
Wet-Dry Bulb Hygrometer, Wall Mounted Thermometers - Eisco Labs
Taylor Mason Hygrometer,Range 0/120 F 5525J1