Real Canadian Red Cedar Wood: Our sauna thermometer and hygrometer is handmade from sustainable knotless wood and polished to perfection for a superior look and feel. Enjoy the beauty and aroma of certified red cedar wood from Canada. Fahrenheit First: The thermostat displays Fahrenheit ( F) on the outer circle and Celsius ( C) on the inner circle. The hygrothermograph displays relative humidity (RH). Both instruments are carefully calibrated during assembly and easily recalibrated if needed (instructions included). Golden Dials: Beautiful, waterproof, subtly iridescent gold gauges provide your sauna with accurate temperature and humidity measurements using a natural metal mechanism.