Invaluable if you have limited heat sensivity. It comes with a stand that it sits in on the edge of the bath. When it’s not in the water it serves as a bathroom clock, but when it is put in water it automatically switches from a clock to a thermometer. You set it to your ideal maximum temperature and, if the water gets too hot, the display flashes until the water cools to just below your maximum. The LCD display is big and clear and it can be set to Fahrenheit or Celsius. Spring Chicken recommended.