Certified Digital Jumbo Display Thermometer with Bottle Probe. Certified to NIST: To assure accuracy an individually serial-numbered certificate is provided from our ISO 9001 quality certified facility. It indicates standards provided by NIST (National Institute of Standards and Technology). 32 to 122° F/0to 50°C ambient; -58 to 158° F/-50 to 70°C probe with 0.1° accuracy.