Small lover can be accurate - 6-8 lbs between it and the factory pump, at 110+ psi so can only be normal air loss - accurate enough for needs; You want to track the exact science of airflow and tunneling of wind particles. In truth, the little boy is reaching for that Presta nipple like he was born for the moment to complete the task at hand. Holds psi readings until you pull the trigger and then are ready to take the other side of the equation; Frankly, if Zephal doesn't know the dimensions of the French valve, then the world is in a worse state than some realize. The device is only 10 centimeters high, 4 inches high, the dial is large enough to be seen, light weight, molded plastic can appear under the top shelf, it is rarely entered to be sure. The item also arrived within the estimated time frame. So far I recommend, worth spending, no questions asked. All lengthy problem tests are updated over time for your information. FOLLOW-UP: Though you can freely take this with a grain of salt - as I haven't tried all the Prestadigitation tire sensors with reading; Even though I've familiarized myself with the return process, I don't know what I don't like about this seemingly solid device? On the other hand, I admit that I didn't try - because I didn't know anyone else. Need a car that pedals this way, but I can report that Valve's French side measures tire pressure accurately, quickly and with barely a whisper of air loss of a pound per square inch while doing so, if it does, it holds up the reading until you press the "Press" release button. It's made from some kind of plastic-like polymer, but with some sort of solid injection molding so it doesn't feel or work, which could be seen as a cheap route given the selfie photos. In the same vein, check out the Zefal price and contact me if you find something cheaper. - swan.