What should R-134 charged systems should be leak checked with?

What should R-134 charged systems should be leak checked with?
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Halogen sniffer or luminescent dye with a UV light. If you'vealready evacuated the system, and have a means to do this andevacuate it afterwards, I'll often take compressed nitrogen, put a250 psi positive charge on each side, and see what turns up. Thisis done after I know for sure there's a leak.
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