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Seesaw thermometer is a thermometer design for blinders.It works without any electricity. There are three fulcrums that indicate 37, 38 and 39 centigrade. Each fulcrum is installed at the balance point of the exact temperature. For example, when the thermometer is set at 37 centigrade mode, if the thermometer turns to left, it means that the left part is heavier than the right part, and your body temperature is under 37 centigrade. When the thermometer turns to right, it means your temperature is above 37 C, so you should set it to 38 C mode and put it on the desk again to see which side it falls and so on.