The K Thermometer Model CA863 is a portable, compact meter designed to use external K thermocouples as temperature sensors. The Model CA863 offers dual inputs for performing differential measurements.. Features include MAX and HOLD functions, a high resolution 0.1 ° setting and an easy-to-read 3 1/2 digit backlit LCD. The Model CA863 offers the ability to easily switch between temperature readings on both channels (T1 & T2) and differential (DT).