This thing is great. There is no comparison to air pressure pens, which vary widely between readings and are consistently inaccurate. I noticed accurate measurements between controls and controls up to the PSI originally measured. I also like that the dial will hold your reading until you release the pressure. If someone buys one and thinks it's not working properly, all you may need to do is tighten the gauge and hoses. To do this, simply tighten/turn the nut to the stop and seal. I believe this feature is a backup pressure relief in case the main release fails. Highly recommended!
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