A thermometer for a sauna is a great addition to keep your stay inside the sauna safe and comfy. This is especially important if you have a cardiovascular disease for example – temperatures that are too high can seriously put your health at risk. Healthy people are at risk too – you can dehydrate after a long stay, or get burns on your skin. There are more things to be considered here compared to the standard spa and hot tub safety, so getting a thermometer allows you to know when to adjust the temperature and when it’s time to leave.