I got a dial indicator to use when I eventually dial in my bellhousing. I got the FIRST one pictured below. My question is why does the dial go from 0 to 15 back to 0? The needle only sweeps in one direction regardless of which way the needle moves so I am curious why this dial indicator is designed this way. It will work fine for this purpose since the alignment tolerance is up to 0.005". I see that other dial indicators go from 0 to 100, like the 2nd picture below. So there must be a reason for the difference between these two styles.