This student grade red liquid thermometer is etched with 1 degree increments. Thermometer is shaped with an anti-roll triangle and is housed in a convenient re-usable plastic storage tube. White back 11-3/4″ long. -20 to 110 C, 0 to 230 F, Partial Immersion Thermometer. Ages 13+. Sold as a pack of 12 thermometers. Recommended age 13+ years