This certified Hygrometer-Thermometer combination is 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°F to 230°F. The calibration and certification are done under ISO-9001 control. The bi-metallic thermometer on the thermo-hygrometer is accurate to ±1% of scale with a range of 0°F to 210°F.
This is the only humidity indicator that we know of that has a 1-year guarantee and a 5-year warranty. Both the humidity and temperature are directly read without any calculations whatsoever.
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