The Omega models 873C and 873F are Hand Held Digital Thermometers. Both instruments have large easy to read liquid crystal displays (LCD). The input connection consists of a subminiature, type K thermocouple, female connector (SMP-K-F). This input accommodates any OMEGA type K thermocouple probe fitted with an SMP-K-M connector. Cold junction electronic circuitry in the 873F/873C automatically compensates for ambient temperature changes. These instruments also provide piece-wise linearization conformity for thermocouple nonlinearity. The instruments are powered by a 9V battery. Continuous operation of 350 hours is typical with an alkaline battery or 200 hours typical with a carbon-zinc battery.