cayugad,I have the original chrony which is similar to the F1, I have use it for something like18 years it still does the job I just set it up and put my spoting scope on the tripod so I can read it with out running out on the range all the time and I mark all my answers down and keep them in a note book so I can refer back to them.I would like one of the new ones but cant justify the expense as long as this one works good.Lee