I just started reloading and I opted for a digital caliper to check my OAL. When I first got my caliper i checked it on various things of known measurements. It was off by +/- .1 I figured the caliper was right (and it might be) and decided i was fine. When reloading since I am a beginner I am checking the OAL of all rounds I make. I am loading 9mm and my low tolerance is 1.4". When i was checking my all my newly made ammo, I was getting a lot of 1.099" I fiddled with my seating die, machine etc..., but it kept doing the same thing. To make an already long story short, my caliper skips from 1.099 directly to 1.415. This is just to let everyone know to really check your digital caliper before you use it. On mine it, it appears everything is fine over 1.415 (checked against many rulers) and below that, it is off by a wide margin. I am sending it in to get it replaced.