I am in the market for a 6" dial caliper and can't decide between Mitutoyo, Starret or Brown&Sharpe. I have a cheap digital set right now, which works fine, but I'd rather have something that does not require a battery. My dad is a FAA licensed inspector in the jet engine industry and says his shop uses Mitutoyo calipers but his Coordinate-Measuring Machine is a Brown&Sharpe?