Sauna Luxury Hygrotherm from Finnsa with all-round screw-on flange combined precision device with sauna hygrometer and sauna thermometer measuring areas: hygrometer 0 - 60 % rel. Humidity Thermometer 30 - 120 °C Sauna Measuring Areas Contrasting Colour Housing Stainless Steel Diameter Approx. Diameter 130 mm tip: to achieve the most precise measurement result, you should mount the measuring instruments at the top of the sauna tank. All measuring instruments can be adjusted with a small screwdriver.