These mercury free thermometers are traceable to NIST and cover ranges from -90 to 25°C or -130 to 80°F. Verify sample temperatures in freezers/ulta-low freezers. Accurate temperature reading without sample contamination is achieved by using the filled bottle (included), which mimics the sample. Insert the thermometer into the bottle and place near the samples for best results. Thermometers contain organic liquid, or EnviroKleen certified Enviro-Safe liquid; feature permanently fused markings and lead free glass. PFA coating on select thermometers safely contain glass and liquid in case of breakage. Manufactured and tested by our USA quality team; individually serialized. Includes multi-language (English, French, German, Italian, Portuguese, and Spanish) Statement of Accuracy and Traceability. Should you require an individual Thermometer Calibration Report, factory calibrated thermometers or custom calibration services are available. Research, industrial and healthcare professionals rely on SP Scienceware for their sample handling needs. Sold worldwide, Bel-Art and H-B Instrument brand laboratory supplies include over 5,000 items from safety wash bottles to fume hoods, thermometers, racks, desiccators, hydrometers, ice buckets, scoops and spoons. Custom calibration services, plastic molding, specialty coatings and wire manufacturing are also available. Wilmad-LabGlass brand laboratory glassware complements Bel-Art and H-B Instrument with over 7000 items including NMR and EPR consumables and specialty glassware, as well as custom fabrication for individual glassware, glass repair services and OEM glass parts. SP Scienceware is a division of Warminster, PA based SP Industries which also include SP Scientific laboratory, thermal management, and pharmaceutical production equipment and SP Ableware aids for daily living.