I have an Oehler 35P, a ProChrono Pal (actually two), and a Magnetospeed Sporter. All three work fine, but the Oehler is the one I depend on when I absolutely require precise results.
The other two are good choices for somebody who doesn't want to spend as much money, and I'd recommend them over the other relatively inexpensive chronographs I've used over the years. The Magnetospeed does affect point of impact and accuracy when mounted on the rifle's muzzle, but a bench-top mount can also be rigged.
