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The instructions that came in the box did not include steps to calibrate the device. I figured out how to setup and calibrate the device which I’ll summarize below. Overall the thermometer is both accurate and produced consistent Body temperature readings by scanning 3-5cm from the forehead. I tested consistency by scanning my temperature 10 times over an hour and yielded the same temperature each time. Model No.: JXB-178 Steps: Open the box indoors. Do not touch the infrared reader which is the barrel of the scanner. Read the instructions to familiarize yourself with the buttons. Install 2 AA batteries at the base of the handle with one oriented + and the other - according to the signs on the inside of the lid. Pull the trigger to turn on the thermometer. Let the thermometer stand out of the box for 15 minutes so that the device temperature reaches equilibrium with the ambient room temperature. After 15 minutes, pull the trigger to turn on the device. Select Body mode by pressing the MODE button. Press and hold the MODE button for 2 seconds. You should hear 1 beep and see a flashing F-1. Press the MODE button to toggle between Celsius and Fahrenheit units. Press the MEM button to select the high temperature alarm threshold. You should hear 1 beep and see a flashing F-2 on the display. Press the MEM button again to select the temperature offset. You should see a flashing F-4 and then the current offset will be displayed. Press and hold the MODE button to change the temperature offset until you reach your desired offset. The offset will run through a range of values from -5.0 to +5.0 by 0.1 increments. I set mine to 1.4. Press MEM to save. Hold the scanner 3-5cm away from your forehead. Pull the trigger once to turn it on. Pull the trigger again to scan your temperature. Use it on someone at rest who you know is healthy with a normal body temperature as a reference of 98.6 F. Recalibrate by adjusting the offset until the reading is 98.6 F.