Glass thermometer with yellow background, black marking and red spirit is a high contrast thermometer for easy reading. This is a dual unit thermometer so that it can read in Celsius or Fahrenheit. In one side it is graduated based on the degrees of Celsius from -20 up to 110. On the other side it is graduated based on Fahrenheit from -4 Fahrenheit to +230 Fahrenheit.Calibrated for: Partial immersionA partial immersion thermometer has a line around it (above the bulb and bellow the marking). This line is called immersion line. For accurate reading you must insert the thermometer (usually in a liquid) up to that line.Each thermometer is individually packaged in a plastic tubular container. It also has an elastic bumper that can be positioned at any height as needed. Length: 30 cm (12 inches).