Involvement:General (knows how to use it) - Ownership:1 day to 1 week
For me none.
I tested my device with R134.The result:
Very low sensitivity. It detect R134 only if the leak is so major thath it makes hissing sound. If leak is small the device did not detects anything. The sensitivity knob seems to do nothing. I did not sens change in sensitivity by turning the knob.
Maybe if you look for major leak in noisy environment it will do the trick but I doubt usefulness of the detector.
The test was done only with one device, so maybe mine is broken, but if the other ones are the same, you must not buy this detector.
High price for the job it does.
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