A sauna without a thermometer is guesswork. These wall-mounted thermometers and hygrometers tell you the temperature and the humidity at bench height, which is what decides whether the room feels right. The collection has wooden two-in-one gauges that suit a traditional sauna, a stainless steel version for a modern or steam room and a large-dial gauge with a clear scale in both Fahrenheit and Celsius.
Mount the gauge on the wall at about the height of your head when seated on the upper bench, away from the stove and not directly above it, and give it a few minutes to settle after the sauna heats. The product pages give the dial diameter, the measuring range and the mounting hardware included.
The rest of the sauna, from buckets to headrests and felt hats, is in sauna.