Thermco ACCR0201S ACCU-SAFE Enclosed Chamber Bottle Spirit Filled Thermometer for Refrigerators, 125mm Height, -5 to 15&deg;C Range, 0.5&deg;C Division NIST Certified & Individually Serialized Certificate Provided with each Thermometer Kit. Product does not expire, it needs to be re-certified every year. Spirit Filled Thermometers Thermometers are Fluoropolymer Coated for Protection Unbreakable Bottle filled with Non Toxic Liquid Thermometers in 0.1C - 0.5C and 1.0 degrees_celsiuss, Medical, Science, and R&D Industries