1. It won't hold vacuum when the pump tip is closed. Go from 15psi to 0psi in 10 seconds.2. I can't always download. After the initial inflation, if you don't wait until the cylinder is all the way down when you pull the trigger, the vacuum won't increase at all. If you wait until the cylinder is all the way down before pulling the trigger again, you've already lost at least 5psi!3. Even with the cylinder going all the way down, it can't get the vacuum above 23psi even though the scale goes to 30. I've used another pump in the past that was about the same price as all of the above. much better.
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