A durable metal frame encases the La Crosse Technology 204-1550 19.25 Galvanized Metal Thermometer. Analog thermometer doesnt require batteries for operation and can be hung either inside or outside. Keyhole mounting on back for hanging on long screw or nail (not included). Measures temperature in Fahrenheit or Celsius. Mercury-free, weatherproof design. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Thermometers & Barometers.