Digital thermometers verify sample temperatures in freezers, refrigerators, incubators and ovens.Accurate temperature reading without sample contamination is achieved by using the filled bottle (included), which mimics the sampleAll models include accredited calibration documentation that meets the requirements of ISO 17025Tested and calibrated in H-B's exclusive triple accredited/registered ISO/IEC 17025:2017, A2LA accredited laboratory (Cert #2448.01), against equipment traceable to NISTIncludes multi-language instructions (English, French, German, Italian, Portuguese, and Spanish)Individually serialized, CE markedNote: Plastic bottles cannot be used in ovens, and glass bottles should not be used above 200 °C.