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Snap-On Electronic Sight Glass (for AC Systems) - $50 (Caledonia)
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Know when the system is really full by adding freon until the unit does not detect bubbles anymore!
I am selling this AC Refrigerant bubble detector (acts like a sight glass). Used but in good condition. Manual and Case included.
Retired from the industry now.
Local pickup/willing to meet in town if I am heading that way. Used to detect air in the AC system like the old sight glass used on older vehicles (air not wanted for efficiency)
Cash only!