Mastercool's "Inspector" 2 in 1 Electronic/UV Leak Detector, No. 55200, delivers an accurate and instantaneous leak detection. It includes an ultra-bright UV LED and an A/C "sniffer." The sniffer, which can detect leaks as small as 1/10 oz per year, features six levels of sensitivity for 15 levels of detection and a tri-colored visual leak level indicator. It meets SAE J1627 and CE Conformity and comes with UV enhancing "yellow" glasses.