Maximum and Minimum Mercury Thermometer, - 40°C to +50°C Celsius Range, Each

Mercury filled min/max thermometer, white-backed glass and dual case. For indoor or outdoor use. Shows the current temperature and register the lowest and highest temperature attained since the last reset. U-shaped, mounted on a plastic casing, with metal floats at the top of each column. One float remains at the maximum temperature, while the other float remains at the minimum temperature.