I received in the mail on Monday the Topeak SmartGauge D2 (Digital Air Gauge). I had to order one since I get tired of trying to figure out the exact air pressure in my tires. The floor pump I have is not the most precise since it has marks for every 4 psi which makes it hard to figure out what air pressure feels good for the trails. So, last night I had to test it out and it ROCKS. No more hitting the trails and being to low where you feel the rim hit or to much and it is like a basketball going over roots. The best thing about it is the bleed valve on it. It is nice and slow, so you don't blow through 2 psi's in a matter of a nano second and then have to pump the tire back up again. It takes the guess work out now from the floor pump gauge and gets the tires feeling right. The head rotates making it easy to fit between spokes and be able to read the huge LCD display without doing a handstand to see it. This will definitely be the most used tool in the toolbox now.