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.
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