This H-B Instrument® FRIO-Temp® Toluene filled ultra low freezer thermometer has a temperature range of -90 to 25°C. Use to verify sample temperatures in ultra low freezers, refrigerators and incubators. Traceable to NIST, DKD/PTB and most standards through ILAC. Each thermometer features PTFE safety coating , a detailed Calibration Report stating corrections to one-tenth of the smallest division, and individual serial number. Tested and certified in our triple accredited ISO/IEC 17025:2005, A2LA accredited laboratory against equipment whose calibration is traceable to NIST and DKD/PTB. Individually packaged. Made in the USA. Individually serialized. PTFE safety coated for safety. Liquid Fill: Toluene. Bottle Fill: Glass Beads. Range: -90 to 25°C. Divisions: 1°. Length: 145mm (5.7 inches). Accuracy: 1°C, 1.5°C below -40°C. Calibration points: -40°C. 5/Case. H-B Instrument® #: 20630C.