The Nulksen air compressor is a portable device that you can take with you in your car to inflate tires. It comes with different attachments for different bouncy castles. The readings were a bit confusing at first as the numbers kept switching back and forth between "psi" and other units of measurement used. What I learned is to hold the button down to toggle back to "psi" before inflating. This and the fact that the readings were very low at first before jumping made me doubt the accuracy of the readings. but after pumping it up (which is VERY quick and literally takes seconds per 0.5psi) it seemed to work as the tire gauge went back to normal in my car. Overall, I recommend this for its portability, ease of use, and price. Be careful and take your time to assess if the display is acting weird at first.
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