The Lufft 4F100 Hygrometer Thermometer, Moisture Content Meter indicates relative humidity, temperature, comfort level, dew point, and indication of night frost.

The hygrometer is accurate to within ±4% RH, and utilizes the Lufft Durotherm element. A synthetic hygroscopic fiber that expands and contracts in response to the moisture in the air.
 
The thermometer is accurate to ±1.5% of scale and has a range of 20 - 100°F, utilizing the Lufft bimetallic movement. Bimetallic springs transmit changes in temperature through expansion and contraction.
 
This precision Hygrometer Thermometer Moisture Content Meter will provide years of trouble free service.

Features:
- 4.25" Brass Case
- 4" Silver Dial
- Measuring Ranges: Hygro 20-100%, Thermo 20° to 100°F
- Accuracy: Hygro ±4% RH. Thermo ±1.5% of scale
- Dial Graduations: Hygro: 2% RH. Thermo: 2° F

For over 100 years Lufft has produced high quality instruments. The Lufft 1 Year Limited Warranty covers the 4F100 hygrometer thermometer moisture content meter.

Availability: Discontinued.