The first did not work. It beeped constantly at the green light in the office, but even holding it in front of the freon tank valve when it was slightly ajar, he couldn't detect any freon escaping. Replacement, the second one arrived before I sent the first one back. Tested it and it works as it should. My guess is that there are quality control issues with the manufacturing or that they are damaged in some way between production, storage, shipping and receiving the device. replace and try again.
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