AccuTools eL-520 Refrigerant Gas Leak Detector (Mfg. part no. A10211) is the most technologically advanced of its kind. The fully automatic eL-520 low power requirements, small size and high sensitivity combine to create a tool which is easy to handle and ultra effective at locating even the most difficult-to-find leaks. Fully SAE J1627 compliant, the eL-520 will detect leaks as small as 0.1 oz/yr (3g/year) in R12, R22, R134a and other halogen refrigerant systems. Made in the USA.