This Slime 2020-A Dual RV (10-160 PSI) Gauge comes in very handy. A tight fit on the valve stem is easy to establish and the release next to the pressure gauge is also very convenient; After you take a reading, the gauge needle stays at that reading until you pull the trigger, which I sometimes find easier than reading the gauge when it's connected to the valve stem. In addition, the release allows the air to escape from the over-inflated tire, making it easy to deflate to the desired point. Immediately after removing the pressure gauge from the packaging, a very strong, rather unpleasant, chemical smell appeared, which lasted about a week, but has now completely disappeared. I would buy this sensor again and give it as a simple but very useful gift. Conclusion: I really like this sensor. Update May 30, 2009 Today I thought my sensor was broken. It wasn't holding pressure and the exhaust valve seemed to be losing air. The problem was connecting the hose to the pressure gauge. The hose had unscrewed from the gauge port and there was air leaking. I tightened it and the sensor works perfectly again.