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The H-B Instrument Frio-Temp Supreme verification thermometer is used for verifying temperatures in freezers, refrigerators, and incubators in laboratories and food service systems. The thermometer measures temperature from -50 to 70 degrees C (-58 to 158 degrees F) with the included bottle probe and 0 to 50 degrees C (32 to 122 degrees F) without the probe. The measurement accuracy is + or - 1 degree C. The 10mL plastic bottle probe is attached to the unit by a 3m/9.8 feet waterproof cable. The unit has a minimum/maximum temperature memory for monitoring consistency of measurements and a user-selectable audible alarm. This thermometer is traceable to National Institute of Standards and Technology, indicating that it is calibrated to International Organization for Standardization (ISO) 17025 levels. The Frio-Temp Ace thermometer is used by scientists and food-service workers. Specifications Power supply (1) AAA battery Temperature range with probe -50 to 70 degree C (-58 to 158 degrees F) Temperature range without probe 0 to 50 degrees C (32 to 122 degrees F) Accuracy + or - 1 degree C Standard met International Organization for Standardization (ISO) 17025 Probe size 10mL plastic Cable length 3m/5.8 ft. Dimensions, base unit (H x W) 64 x 95mm/2.5 x 3.7 inches Digital thermometers are instruments used to measure the temperature of air, liquids, or surfaces electronically. They may measure temperature in Celsius, Fahrenheit, or both. Most digital thermometers use thermistors, which are small electronic resistors. Thermistors are made out of metals that conduct electricity within a certain range and become more conductive the warmer they get. A microcontroller inside the thermometer measures this electrical conductivity and converts it to a temperature, which is displayed on an LCD. Digital thermometers are used in a wide range of applications, including in laboratory settings, food service and storage, and in doctors' offices and hospitals. H-B Instrument Company manufactures time, temperature, density, and weather-related instruments. Founded in 1903, H-B Instrument Company is a division of Bel-Art Products, and is headquartered in Collegeville, PA. 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. 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.