Revolutionary E_MOS® Technology developed by CPS is more sensitive, stable and accurate than any other detection method on the market.*U.S. Patent # 8,555,701Features:Progressive Alarm ModeAlarm pitch and number of lighted LEDs progressively increase as the leak source is approached. Allows searching for a broad range of leak sizes.Threshold Alarm ModeProvides a quick go, no/go verifying a leak has been found and approximate size.One button controls On/Off and all functionsMicroprocessor controlled sensor improves sensitivity and reduces false alarmsPatented EMOS detection technology increases battery and sensor lifeReplaceable EMOS2 sensor, sensor filter and sensor tipMetal sensor housing with patented water vapor stabilizing filter eliminates false alarms due to condensateOptimal leak-finding performance under a broad range of conditionsSimple, intuitive bar graph LED displaySoftware managed sensor rejuvenation at startup ensures highest sensitivityMeets or exceeds all US and international standards for automotive and commercial useErgonomic, high-impact housing with high output alarm speakerLow battery indicationDesigned and manufactured in U.S.A. with U.S. and globally sourced components