here is a $30 gauge with the same accuracy as the $300 gauges. same accuracy as my analog but i can read it easier as well. http://www.ebay.com/itm/0-12-7mm-0-5-0-01mm-Digital-Probe-Indicator-Electronic-Dial-Test-Gauge-/221842075927?hash=item33a6d17117:g:YRQAAOSwd0BVvVVD