*The Optics collected the infrared energy emitted by object and focus onto the Sensor. Then the sensor translates the energy into an electricity signal. This signal will be turned out to be digital shown on the LCD after the signal amplifier and processing circuit.Specification: * Measurement Range: Between -50 °C and 550 °C (Between -58 °F and 1022 °F ) * Accuracy: ± 1.5% or ±1.5°C(0 °C(32°F) to 550 °C(1022 °F )); ±3°C(-50 °C(-58 °F )to0 °C(32°F)) * Repeatability: ± 1% or ±1°C * Resolution: 0.1°C or 0.1°F * Response Time: 500mSec,95% response * Distance to Spot Size: 12:1 * Spectral Response: 8 - 14 um * Storage Temperature: Between -20°C and 60°C (Between -4 °F and 140 °F ) * Operating Temperature: Between 0°C and 40°C (Between 32 °F and 104 °F ) * Operating Humidity: 10 - 95% RH non-condensing, up to 30°C (86°F ) * Power: DC 9V battery (included)Note: This product is certified with CE, FCC and RoHS.Package Included: 1 x IR Thermometer 1 x User manual 1 x DC 9V battery