"These robust and reliable meters work in any environment from the lab to the production floor. The sturdy optional armor protects against knocks and jars. All models are ergonomically designed for both large and small hands alike. The sealed keypad and ABS case meet IP54 standards for splash resistance. Features include a large easy-to-read illuminated display, an easy-to-use five-button control panel, Min\/Max, Hold, °F \/ °C switchable, auto shutoff, and low battery indicator. Each thermometer is individually factory calibrated. Automatic field calibration is easily performed. Simply place the probe in a container packed with ice, fill with water, then press the \"CAL\" button—meter automatically recognizes the freezing point."