【Wall and Lanyard Mounted】Wall mounted: The sauna thermometer can be fixed to the wall of a traditional sauna room for use as an indoor wall mounted thermometer and hygrometer . Lanyard mounted : Compatible with portable steam sauna boxes , offering flexibility and saving space . The rope length is freely adjustable from 5 inches to 21 inches (12.7-53.34 cm) to fit sauna windows of different heights 【Manual Calibration】The indoor humidity and temperature monitor gauge adopts mechanical design , avoids the need for battery power , avoiding the risk of battery failure in high temperature environments . It supports manual calibration ; precise calibration can be completed with the included screwdriver , requiring no additional tools 【Heat Resistant and Waterproof】This metal mechanical thermometer is heat resistant , and waterproof , easily handling the extreme environment of a sauna with its high temperature and humidity . Equipped with a 3.7 inch/9.5 cm pointer dial , clear scales , prominent numbers , and a red pointer , plus anti glare glass , it allows for quick reading of temperature and humidity values even in steamy environments 【Precise Measurement】Our hanging sauna temperature gauge covers a temperature measurement range of 68-212°F and a humidity measurement range of 0-100% , enabling real time monitoring of temperature and humidity changes in sauna rooms or indoor environments . Note : This product has a mechanical structure ; temperature measurement has a normal error of ±3°F , and humidity measurement has a normal error of ±5% 【Wide Application】The metal sauna thermometer hygrometer is suitable for traditional sauna rooms , steam sauna rooms , and infrared sauna rooms . It can also be used as an indoor thermometer and hygrometer in hotels and homes