H-B Instrument DURACPlus Verification Thermometers DURACPlus Verification Thermometers are used to verify sample temperatures in Freezers, Refrigerators, Incubators and Ovens with traceability to NIST, DAkkS and most standards through ILAC. Each item features individual serial numbers and a Statement of Accuracy indicating accuracy traceable to NIST. Tested and calibrated in our exclusive triple accredited/registered ISO/IEC 17025:2005, A2LA accredited laboratory against equipment whose calibration is traceable to NIST. Ideal for chemical industry, petro chemistry, 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.