AMAZING TOOL! Worked the first time and within minutes all four TPMS sensors were set up and working great on my 2018 Chevy 1500 Z71 5.3L. I showed four horizons. lines without even reading before using this learning tool. The dealer said the wheels had no sensors lol and the company that made the lift and wheel pack for them "forgot" to put them in. $8,000 Package! The chief mechanic at their MASERATI shop where I was sent to avoid a 45 minute drive through snow and ice even used the latest and greatest learning tool and then even physically wiggled the valve stem and said he was 100% sure make sure the sensors are ok. not there. I wasn't convinced, and when I got home I climbed in only to find a second set of valve stems inside my fuel hostages. I checked the stem profile and it was brass with a slight taper and definitely TPMS. So I ordered this product. I'm done with an incompetent dealer. The reason I'm sharing the "long version" here is that some people may not know that they actually have a second set of valve stems and if you buy this tool and don't point it directly over or under the correct rod ( for example TPMS in the wheel) does not work; They assume it's an incompatibility issue between the tool and your TPMS system when in reality it's just out of reach. Anyway, hope this helps someone out there. In general, the tool is of very high quality and worth the money.