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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. The WD3542721 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.