In the OS641/OS642 Series of stick-type infrared thermometers, designers will find a host of useful features including a backlit LCD. The instruments offer a Farenheit measurement range of zero to 500° and accuracy of ±3%. They provide an analog output of 1 mV/°F and make use of a thermopile detection element. An auto-hold function kicks in after user releases the Measure button. Selected models offer a laser sight.