http://www.ridgid.com/Tools/micro-LM100Resolution is 1/16". This tool is essential for speaker positioning. When the tweeters are exactly the same distance from your ears the soundstage sounds great and the tone becomes very smooth and clean, delicate, exquisite. I don't know what this one will cost, but the competitors are a couple hundred bucks. I hope this one is cheaper as I would love to someday own one myself, instead of always borrowing Carl's Leica laser.
Ridgid is an American company subsidiary of Emerson Tools that makes excellent quality products. They have 4 factories in USA, 2 in Europe and 1 in China. If you register any Ridgid product after you buy it from Home Depot, it is guaranteed for life. I have been very happy with my Ridgid tools.