The Extech 42510A Compact Thermometer is a versatile and reliable instrument for temperature measurement in a wide range of applications. This compact thermometer is designed to provide accurate readings and convenient features for professionals in various industries, including HVAC, automotive, electrical, and more. The Extech 42510A thermometer offers a broad temperature measurement range from -58 to 1200 degrees Fahrenheit (-50 to 650 degrees Celsius). With its high 0.1-degree resolution, it provides precise temperature readings up to 999.9 degrees, allowing for detailed and accurate measurements. The thermometer features adjustable High/Low set points with an audible alarm. You can program specific temperature thresholds, and when the measured temperature exceeds these set points, the thermometer alerts you with an audible alarm. This feature enables proactive monitoring and timely intervention to prevent temperature-related issues. To ensure accurate measurements on various surfaces, the Extech 42510A offers adjustable emissivity. Emissivity is the measure of an object's ability to emit infrared energy, and adjusting it allows for better accuracy when measuring different materials or surfaces. The built-in laser pointer enhances targeting accuracy by identifying the specific area being measured. This feature helps ensure precise temperature readings on the desired target, especially when measuring from a distance. The backlighting feature illuminates the display, making it easy to take measurements in low-light conditions or at night. This allows for enhanced visibility and readability of the temperature readings in environments with low background light levels. With a distance-to-target ratio of 12:1, the Extech 42510A provides flexibility in measuring temperature from a distance. This ratio indicates the size of the area being measured in relation to the distance between the thermometer and the target. A higher ratio allows for measuring temperature from a greater distance, providing convenience and safety in certain applications.Additional features of the thermometer include Data Hold and Min/Max functions, allowing you to freeze and store the displayed readings as well as track the minimum and maximum temperatures recorded. The over-range indicator alerts you when the measured temperature exceeds the range of the instrument, ensuring accurate measurements. The Auto power off function helps conserve battery life by automatically turning off the thermometer after a period of inactivity, extending the operational time and preventing unnecessary power consumption.