Commercial cold sweat alarms monitor the skin temperatures and relative humidity of diabetics, normally using a device strapped to the wrist. Usually worn at night, the devices give an alert of a potential hypoglycemic event (cold sweat) when the skin falls below a predefined temperature and above a predefined relative humidity. For example, I have seen one device where the default alarm settings are a SIMULTANEOUS fall in temperature below 30.5 degrees C and above 80% humidity. I would like to know whether any research lies behind these threshold levels, especially that of the skin temperature? How far does the skin temperature typically drop during a cold sweat? It should be emphasised that the temperature being measured is of an area of skin trapped behind a tightly worn device, i.e. there is no ventilation, rather like the skin temperature underneath a wristwatch.