Topeak Digital Smart Gauge D2
The second-generation digital gauge features a rotating SmartHead and works seamlessly with Presta and Schrader valves without changing parts. Precision digital gauge reads up to 250 psi and is designed for use with tires, suspension forks and rear shock units. LCD display can be programmed to show pressure in psi, Bar, or kg/cm2.
I think this product is great. Its the first digital pressure guage I've had, but it works awesome. I haven't had to replace the batteries, and I've had it for about six months. Its easy to go from schrader to presta. I had it set on presta for months and was still able to get pressures out of a schrader.
Compact for carry in your pocket; displays very clear with good size. Measurement is very exact. Rotatory head is very useful. I'm not sure if mine has a problem, but battery life is very short (about a month.)