How accurate is a 0-1” micrometer outside of a lab? How much does temperature influence it? If temp plays a role, why does the brass I turned during a hot summer night last year still measure the same on a mildly cold morning today? Random thoughts while turning some brass last night... BTW... I tried some engine assembly lube last night instead of imperial. It worked fantastic and cleaned easily in a sonic cleaner. Using a qtip in the necks for expanding and a dab on the mandrel along with an ice pack for the turner, I was able to hold the best tolerances I ever have.