SoC (System-on-a-chip) Technology, complete infrared design incorporated on a single chip, creating compact and lightweight design. Innovative optical lens - high accurate measurements over wide temperature range; 10: 1 distance to spot (D: S) ratio. Laser pointer simply point at desired target and press trigger for temperature reading. Visual low battery indicators; requires two "AAA" batteries. Measurement range: -76 to +932F (-60 to +500C) To measure a surface temperature, the user aims the IR Thermometer at the target, presses a button, and reads the temperature display. The device has an optical lens that collects the radiated infrared energy from the object and focuses it on the detector. The detector converts the energy into an electrical signal that's amplified and displayed as a temperature reading. An infrared thermometer measures temperature by sensing the magnitude of radiated energy at infrared frequencies. Using this data and the actual temperature of the detector, the thermometer calculates the temperature of the surface that emitted the energy.