557s testo refrigerant gauge fails nitrogen pressure decay test ? or was it the hoses ?
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2ed video update testo 557s refrigerant gauge low side passes nitrogen pressure decay test.
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3rd leak detection for the testo 557s failing nitrogen decay test. (it’s the hose seal)
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pt:5 testo 557s passed vacuum decay test. decay up to 200 micron after 4 hours
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pt:9 testo 557s passes vacuum decay test with flying colors.
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testo 557s possibly leaking low side from refrigerant manifold second test
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ac refrigerant leak , nitrogen finds leak fast !. in this situation. more test needed 
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then your high-pressure nitrogen decay test before recharging
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