I must add my vote for the Oehler 35P. I started with a Chrony, which was fair at best. The Oehler is a truly quality product. I now wonder how I managed to reload all these years without one. Without the Oehler, you are merely guessing. The Chrony just lets you make educated guesses, but doesn't give real accurate data.
I bought mine straight from Oehler, and had superior customer service. I use my Oehler in all kinds of weather and light conditions, and have yet to have a problem. I'm sure I could create one, but I don't worry about it.
Follow Saeed's advice, and buy the Oehler.

Bill

Try Russ Haydon's Shooters' Supply

http://www.shooters-supply.com

Or you can buy direct from Oehler

http://www.oehler-research.com/