Not sure how to rate this item. Uses a bike bladder type clamp/grip (5 stars). 95% of other companies' cartridges are FLY and poorly sealed. It is great. Digital Gauge (5 Stars) REQUIRED for accurate pressure readings in the 160psi range (analogue scales cannot do this). However, I received and sent back TWO bad inflators before finally getting a good one! The first only showed an error code on the digital display, rendering the sensor inoperable. The second had a broken battery contact spring that was floating around the battery compartment and looked like it had been used before (the rubber case was half torn like someone else had tried to put the batteries in before and sent them back that way. Bottom line Is that so? The quality control of this company is terrible (ZERO STARS) This quality control issue is obvious by reading other reviews.