...cool tools from StewMac? I've always just winged it myself....but curious to see if this stuff has helped anyone here.
http://www.stewmac.com/shop/Tools/Measuring_tools/Basic_Setup_Kit.html
http://www.stewmac.com/shop/Tools/Measuring_tools/String_Action_Gauge.html
http://www.stewmac.com/shop/Tools/Measuring_tools/Precision_Straightedges.html

http://www.stewmac.com/shop/Tools/Measuring_tools/Basic_Setup_Kit.html

http://www.stewmac.com/shop/Tools/Measuring_tools/String_Action_Gauge.html

http://www.stewmac.com/shop/Tools/Measuring_tools/Precision_Straightedges.html