Hi Dogvixen.
A popular one is the Combro CB 625 MK4.
I have one here that i use.
But, having spoken to someone, I have my doubts about their accuracy now?
They also need carfull handling and positioning on the rifle when in use.
Seriously thinking of getting a better one at the moment, somthing like the F1.
Just my thoughts, the chrono does an important job, and accuracy is important, so the extra cost is worth it.
Not a bit of kit we use that often, so if you have shooting buddies, might be a good idea to club together and share the cost and use?
ATB.
Bi