This glass alcohol filled thermometer is recommended for laboratory use, educational use and general science experiments. Black numbering on a white background and red alcohol indicator make this thermometer easy to read. Alcohol thermometers are environmentally safe for use at home or school. Usable Range: -20ºC to 150° CLength: 30 cm (12 inches)We recommend anyone who is using mercury thermometers to replace them with high-tech accurate alternatives that are safe, non-toxic and environmentally friendly.This glass alcohol thermometer is available in partial immersion type. It measures a wide range of temperatures from –20ºC up to 150ºC . The Non-mercury thermometers have a guaranteed accuracy of +/- 1.5 scale divisions for their entire usable range. These ranges are comparable to most mercury thermometers of the same type and range. Non-mercury thermometers need to be stored upright or the liquid inside will separate. Instructions will be available for recombining liquid that has separated in a non-mercury thermometer. Each thermometer comes in a protective plastic container. Calibrated for: Partial immersionA partial immersion thermometer has a line around it at the immersion distance from the bottom. It indicates correctly when the bulb and liquid column to that line are exposed to the temperature being measured.