This FRIO-Temp® precision verification freezer thermometer has a range of range -20 to 35°F. It is used to verify sample temperatures in Freezers, Refrigerators, Incubators and Ovens with traceability to NIST, DKD/PTB and most standards through ILAC. Thermometer features a PTFE safety coating . Comes with a multi-language (English, French, German, Italian, Portuguese and Spanish) Statement of Accuracy indicating accuracy traceable to NIST and DKD/PTB. Individually serialized. Tested and calibrated in our exclusive triple accredited/registered ISO/IEC 17025:2005, A2LA accredited laboratory against equipment whose calibration is traceable to NIST. Thermometer features environmentally safe non-toxic, non-hazardous, biodegradable Enviro-Safe® liquid EnviroKleen certified by ChemTel, an independent laboratory, and has the same accuracy as similar mercury-filled thermometers, but unlike mercury-filled thermometers these are 100% environmentally safe. Ideal for chemical industry, petrochemistry, pharmaceutical, medical, cosmetic, producers of chemicals, university, dairies, breweries, distillers, beer cellars, refrigeration house, hot houses, scientific institutes, blood banks, refrigeration/freezer/incubator/oven equipment producers and producers of laboratory equipment. Individually packaged to prevent breakage. Made in USA. Type: Freezer. Thermometer Fill: Enviro-Safe®. Bottle Fill: Enviro-Safe®. Range: -20 to 35°F. Divisions: 1. Accuracy: 1°F. Length: 135mm (5.3in). Bottle Size: 30mL.