The thermoscope, or Galileo thermometer, was constructed by Galileo Galilei in 1607. The difference between a thermoscope and a thermometer is that the latter has a scale. Jean Rey also invented the "Thermoscope", the forerunner of the modern thermometer. In 1607, Galileo Galilei constructed a thermoscope. In 1607, Galileo Galilei constructs a thermoscope. A thermoscope is a device that shows changes in temperature.