I have a very slow R134A refrigerant leak on one of my cars (probably losing about 4 ounces a year). This device was easy to use and the flexible neck stays in the correct position while bending. But even at a lower sensitivity this will still be a false positive by range. It will work, i.e. cycle the power to recalibrate and retest the same range and then get no response. I think for more leakage this block would be ok. Came back for a different model.
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