H-B Frio Temp Calibrated Dual Zone Electronic Verification Thermometer for Freezers, Refrigerators and Incubators; -50/70C (-58/158F) External, -10/50C (14/122F) Internal (B61000-0200) Features audible alarm Includes a 3.3ft (1 meter) waterproof cable Former H-B Part Number: 30715