About 12 years ago the American Measuring Tool Manufacturers Association (AMTMA) published "Searching for Zero" as a guide for anyone calibrating precision tools and gages. It created a stir at that time as many of the beliefs widely held in this field were shown to be just that: beliefs. Since then, it has become a valuable reference document on the realities of dimensional metrology. Many standards writing committees have used it as a source of information in their work.
The first edition sold 17,000 copies; the second edition is completely revised. The first edition included typical uncertainties for various types of calibration procedures so the reader would get a feel for the order of magnitude of it all. Unfortunately, while it did that, it provided fodder for some unscrupulous folks who adopted the values as their own when they had no uncertainty budgets to support their claims. The new edition lists the elements that have to be considered for an uncertainty budget instead of typical values that can be abused.