The Abbeon Cal HTAB-169 Certified Hygrometer and Temperature Indicator is certified to be accurate within ±3% Relative Humidity.
The dial indicates the complete range of 0 to 100% relative humidity. The instrument has been tested at three different positions of the dial at temperatures ranging from 32° to 230°F. The calibration and certification are done under ISO-9001 control.
The bimetallic thermometer on the model HTAB-169 is accurate to ±1% of scale and has a range of -10° to 190°F.
Gradations are 1% Relative Humidity and 2° Fahrenheit.