KOLO hygrometer: a round black dial that shows how humid your sauna is
The KOLO hygrometer is a round dial that shows how much moisture is in your sauna’s air. It reads from 0 to 100 percent. The dial is about 5 inches across, with a black face and a simple Scandinavian look. It hangs on the sauna wall. KOLO designs it in Finland.
A hygrometer tells you how humid the room is. The needle jumps each time you ladle water on the stones and settles again as the steam clears. Watching it helps you find the mix of heat and steam you like and repeat it next time. It is a mechanical dial with no battery or wiring, so it works in any sauna, electric or wood burning. Hang it on the wall near the bench, away from the heater, so it reads the air you are breathing. It comes in black only. Want to watch the temperature too? See the KOLO sauna thermometer, which comes in the same round size. The KOLO hygrometer ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.
FAQ
What does a sauna hygrometer measure?
Relative humidity, shown on this dial from 0 to 100 percent. In a dry-heat sauna the reading sits low, and it jumps each time you ladle water onto the stones, then falls again as the steam dissipates. Watching that swing tells you how much loyly you are creating and helps you find the balance of heat and moisture that feels best to you and your guests.
What should the hygrometer read in a sauna?
There is no single correct number; it depends on your heat and taste. A traditional Finnish sauna runs hot and fairly dry, with humidity rising sharply for a minute or two after each scoop of water, whereas a milder, lower-temperature session can be kept noticeably more humid. Use the dial to repeat the combination you liked last time rather than to chase a target figure.
Where do I mount the hygrometer?
Next to your thermometer, on a wall near the bench at roughly seated head height and away from the direct blast of steam off the heater, so it reports the air you are breathing rather than a momentary cloud. The 4.72 inch (12 cm) dial weighs 2 pounds per the specification table, so fix it to solid paneling with a suitable screw. Your heater manual takes precedence on placement.
Is this hygrometer available in white?
No, KOLO offers the hygrometer in Black only, which is why the listing title says so. The matching KOLO thermometer comes in Black or White, so for a paired set choose the black thermometer. The dial shares the same round 12 cm format and Scandinavian styling, so the two instruments sit together as a unit on the wall. Browse the full KOLO accessories collection.
Does a sauna hygrometer need batteries or calibration?
No. It is a mechanical dial with no battery or electronics, so there is nothing to charge or replace and it works in any sauna, electric or wood-fired. Mechanical hygrometers show relative humidity trends rather than laboratory precision, so read it as a guide to how humid the room feels compared with the last session. If the needle ever seems stuck, a few minutes in a steamy bathroom will show whether it still moves.