I wish I could tell you what chronograph to get, mine is an Oehler 35 that is not made any more . so all I can tell you is what not to get.
DO NOT GET anything that is Shooters Chrony, I had one then I shot it then I shot it again then I smashed it with a large rock and profaned loudly, then attended anger management and I am still pissed that I wasted my money.
p.s. I am a glass is half full kind of guy if I was glass is half empty the review might not have been so positive !!!!!!!!!!
It takes 43 muscle's to frown and 17 to smile, but only 3 for proper trigger pull.