Highlights:

• Large easy-to-read 5" diameter dial
• Case is drilled for wall mounting
• No batteries or external power source required
• Tested at three different humidity positions and includes a certificate of accuracy
• 1 year warranty

This is the only humidity indicator that we know of that has a 1-year guarantee and a 5-year warranty. Some of our humidity indicators working on the same principle as this instrument have been in use for over 10 years and are giving satisfactory service day after day, month after month, and year after year.

Both the humidity and temperature are directly read without any calculations whatsoever. Solid 6-inch overall brass case drilled for wall mounting. Shipping weight: 3 pounds. The thermometer humidity meter is a color differentiated 5-inch dial with black letters, black numbers, and a red pointer.

These hygrometers are certified to be accurate within ± 3% RH. The dial indicates the complete range of 0 to 100% relative humidity. Each instrument has been tested at three different positions of the dial at temperatures ranging from 32 to 230F. The The large easy-to-read dial. The Durotherm humidity sensor is certified to be accurate within ±3% RH. This sensor is constructed of a man-made fiber that expands and contracts as the humidity changes and mechanically linked through precision bearings and gears to the indicator. A calibration screw is accessible through a slot in the case for periodic calibration. The thermometer features a bimetallic coil sensor and is accurate to 1% of scale.