High-precision sensor probes and state-of-the-art microchip provide instant readings that take less than 1s to interpret temperature. This device is fast, reliable, and easy to use to keep an eye on everyone at home. Touch-free: Detects temperature within 1-3cm (0.4-1.2inch) distance from the forehead or any other part you wish to test. Simply set the thermometer to body temperature and press the trigger. Accurate AND Reliable: Infrared lens is precisely engineered to detect temperature with the confidence of +/- 0.1o TRUST THE RESULTS: Ideal for forehead readings, with a minuscule margin of error, an excellent alternative to standard mercury thermometers.