No air leakage. No tricks to make it work. Simply push the valve and remove. The pressure gauge will hold the pressure reading until you press the pressure release button. The same button can be used to deflate the tire while still on the valve, which is handy if you over inflate the tire. When you remove the gauge from the valve you will hear a small puff of air, but that is normal with any gauge. So far it has always worked flawlessly on my racing bike. I check my tires before every ride so they wear out quickly. The only downside is that the sensor is a little heavy, despite being fairly small and easily fitting in a seat pocket. If you're counting every gram, the weight can be an issue, although I don't know how it compares to other Presta gauges. In any case, I highly recommend this gauge as long as it lasts.
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