I just bought a second Oehler 35P direct from Oehler, and highly recommend them. Yes they are a little pricey, but worth every penny. I have 3 different chronys and they will change velocities of known loads depending on lighting conditions, sometimes up to 200 fps, so in my estimation they are worthless. If you only ever buy one chronograph, save your money and spend it on an Oehler 35P, you won't ever regret it, but you sure as hell will regret wasting your money on the other junk that's out there. The 35P is the standard by which all other chronographs are judged, so why not get the 35P. JMHO