MS6550A Non-Contact Infrared Thermometers With USB and software Features Optical Resolution (D:S) (50:1) Wide temperature measurement range Laser target pointer Readout is &#176;F&&#176;C selectable KTC/infrared thermometers selection Temperature Resolution: 0.1&#176;C or 0.1&#176;F LCD with double temperature display and 4 bits MAX (highest), MIN(lowest),DIF(difference),and AVG (average) temperature display Emissivity adjustable (0.10 to 1.00) High-temp and low-temp. Alarming. Data recording (record up to 100 groups of data) Response time: 500 m Sec Laser power: Less than 1 milli-watt Optical Response: 8 um to 14 um Working Voltage: 9V battery Dimensions: Length 140x56x90 Weight: 500g Function Specifications MS6550A Infrared thermometers Temperature Range >510&#176;C 50~150&#176;C 15~50&#176;C -32~15&#176;C Repeat error -32~1200&#176;C(-25~2192F) &#177;1.5% of the reading &#177;(1.5% of the reading + 1&#176;C) &#177;(1.5% of the reading + 2&#176;C) &#177;3&#176;C <0.5% of the reading K-type thermometers Temperature Range -40~1370&#176;C &#177;(1.5% of the reading + 1&#176;C) Accessories: 1 x Infrared Non Contact Thermometer 1 x Standard K-type thermocouple (-40 to 260 &#186;C) 1 x USB data cable 1 x Data communication software (CD) 1 x High quality carry case 1 x User Manual