One day the sensors started giving me wrong readings. Spent a lot of time and freon trying to figure this out. Teflon seals for some hose connections included in the kit should be removed and discarded before first use. I found 100 packs of Geeen rubber cone seals on Amazon and haven't had any problems since. The quality of the pressure gauge seems great for the price, as does the tubing that comes with it. Be sure to only buy high-quality brass can taps. Brass plated aluminum, will strip the threads on the cylinder valve as well as the threads on the refrigerant cylinder the first time or two try to use them. The master mechanic of an upscale specialist shop often gets used to it and has no major problems with it. Be sure to take care of them and have spare batteries for sensors on hand. If you don't know how to use this device properly. STOP, don't buy a tool thinking you'll impress your buddies and make a fool of yourself, and just pay a qualified technician to get it right the first time.
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