70mai Portable Air Compressor Tire Inflator Air Pump for Car Tires DC 12V Tire Pump Preset Tire Pressure for Motorcycle Bicycle

My own readings, in pounds. The first point is the first reading I took; after that a point goes on only when a reading comes in 5% or more away from the one before it, which is why the gaps are uneven. The price above is a later reading that landed less than 5% from the last point, so it has no bar of its own.