Thermometers are essential for taking temperatures in the lab. These thermometers have a yellow backing to make graduations easier to read and they are approximately 11.75 (300mm) long. Our thermometers are filled with alcohol instead of mercury for safety purposes and come in a protective plastic tube. This thermometer is partial immersion and has a range of -20°C to 110°C. PRODUCT WARNINGS WARNING: This product can expose you to chemicals including lead which are known to the State of California to cause cancer birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. Our products are not toys. Use in a laboratory or educational setting only. Not for children 13 and under.