ValuesRus Infrared Non Contact Thermometer is made for professional use as well as home use. It is Hospital Grade and uses American Made Amphenol Infrared Sensor, In Body Mode it is tested to be accurate to within +/- 0.2°C. It houses an Electromagnetic shield and is approved for Hospitals. It has a Programmable Feature for calibrating to different Skin color, because Different Skin colors have different nominal temperature readings. Therefore this Thermometer is customized to every customers family presenting a more accurate reading. The user range is 2”– 6” most other Infrared Thermometers user range is less than 2”. There are two modes Body use and Home use. When in body mode, it has Temperature Sound alerts LO and HI, indicating the temperature is affected by Hair or Sweat or Changes in the Airflow or the measurement distance is to far. For use on Babys and Adults best used on the Forehead, in the home use mode can be used on baby's milk, Bath water, Food and more. Recommended for Hospital and Medical centers where Accuracy is a must. Comes with a 2 Yr Warranty. Please watch my calibration video on YouTube (https://youtu.be/yrYCZ5yoqcg) to learn how to calibrate this product. I strongly suggest that you use a mercury Thermometer when you calibrated it. My video shows me using a electronic internal thermometer but since then I have found that those too are not very accurate. But if you use a Mercury internal thermometer and calibrate this ValuesRus Infrared Thermometer to it you will then have the very best electronic Non Contact thermometer on the market. Thank you for your purchase. Please review this product here on ValuesRus.com and on amazon. If for any reason you are not completely satisfied with this product. My phone number is on the packaging. Please call so I may help answer any question you may have.