I does use a range finder. It is probably one of the 1st that came out. One of the guys at the club bought a new one and gave it to me a couple years ago. It is a Bushnell, not sure of model#, will have to revisit and follow up.
I can honestly say, that since having it in my bag, not only has it given me a better idea of TRUE distances to the pin, it has also helped speed up play in the group. Many guys I play with still don't have one and I will try and help them out.