The Mastercool Raptor Refrigerant Leak Detector with UV Blue Light, No. 56200, is designed to deliver an accurate and instantaneous response. An ultra bright UV LED light is built into the end of the probe, allowing for both electronic and UV leak detection. Notable features include: digital signal micro processor, mute function, visual leak detection indicator, reset function, keypad control, sensitivity level adjustment, battery test function and variable frequency audible alarm. This tool is packaged in a blow molded case with UV glasses, two C batteries and a sensor tip.