DO NOT GET THE ANALOG, GET THE DIGITAL!!!!!!!! Having said that make sure that the heads are held on with set screws. Reason? if the caliber breaks down you can switch it to another caliber. If you are going to get one for yourself get a analog, but for a scorer to score targets at a match, NO WAY A good friend of mine who does the scoring at Holton and at WWCCA if you walked in and said here is your analog calibers, bring the Vaseline with you, they will be easier to get out. But you do what you want.