The Extech 421502-NIST Dual Type K/J Input Thermometer is a versatile and accurate instrument for temperature measurement. This thermometer is designed to provide precise measurements and convenient features for professionals in various industries, including HVAC, electrical, and scientific applications.The Extech 421502 features a dual display, allowing you to simultaneously view two temperature readings. This enables you to compare and monitor temperatures from different sources or measure temperature differentials between two points.With its high accuracy of 0.05 percent, the thermometer ensures reliable and precise temperature measurements. This accuracy is essential for applications where precise temperature control or monitoring is required.The programmable High/Low audible alarms offer added convenience and flexibility. You can set custom temperature thresholds and the thermometer will alert you with an audible alarm when the temperature exceeds the set limits. This feature is particularly useful for monitoring temperature variations and ensuring prompt action when temperatures go beyond the desired range.The thermometer provides additional useful functions such as Min/Max/Average readings, allowing you to track the minimum, maximum, and average temperature values over a specific period. This information is valuable for analyzing temperature trends and identifying temperature fluctuations.The Data Hold function allows you to freeze the displayed temperature on the screen, making it easy to record or take notes without the need for constant monitoring. The Relative function enables you to measure temperature changes relative to a reference temperature, providing a useful comparison for temperature differentials.One of the key features of the Extech 421502 is its capability for differential temperature measurement between Type J, Type K, or both J and K thermocouples. This allows you to measure temperature variations between different thermocouple types, providing versatility in temperature measurement applications. It includes NIST Certification.