- http://www.eastwood.com/sheet-metal-gauge.html
- "Sheet Metal Gauge." Sheet Metal Gauge. N.p., n.d. Web. 29 Sept. 2016.
- http://www.homedepot.com/p/Empire-8-oz-Brass-Plumb-Bob-908BR/100113390
- http://www.homedepot.com/b/N-5yc1v/Ntk-All/Ntt-feeler%2Bgauge?NCNI-5&isSearch=true&style=List
- https://www.amazon.com/Westcott-6-Inch-Plastic-Degree-Protractor/dp/B000F8MFSW/ref=sr_1_3?s=office-products&ie=UTF8&qid=1474884662&sr=1-3&keywords=protractor
- http://www.homedepot.com/b/N-5yc1v/Ntk-All/Ntt-marking%2Bgauge?NCNI-5&isSearch=true&style=List
- http://www.homedepot.com/b/N-5yc1v/Ntk-All/Ntt-micrometer?NCNI-5&browsestoreoption=2&style=List&Ns=P_REP_PRC_MODE%7C0
- http://www.menards.com/main/tools-hardware/hand-tools/measuring-layout-tools-accessories-kits/6-inside-caliper/p-1444431236861.htm?cm_vc=PDPZ1
- http://www.homedepot.com/b/N-5yc1v/Ntk-All/Ntt-outside%2Bcalpipers?NCNI-5&isSearch=true&style=List
- http://www.menards.com/main/tools-hardware/hand-tools/measuring-layout-tools-accessories-kits/6-divider-quick-action/p-1444431236518-c-9149.htm?tid=-1953724572920884726
- http://www.homedepot.com/b/N-5yc1v/Ntk-All/Ntt-folding%2Bruler?NCNI-5&isSearch=true&browsestoreoption=2
- http://www.homedepot.com/b/Tools-Hardware-Hand-Tools-Measure-Layout-Tools-Measuring-Tools-Rulers/N-5yc1vZc99n/Ntk-SemanticSearch/Ntt-steel%2Bruler?NCNI-5
- http://www.homedepot.com/b/Tools-Hardware-Hand-Tools-Measure-Layout-Tools-Measuring-Tools-Tape-Measures/N-5yc1vZc256/Ntk-SemanticSearch/Ntt-measuring%2Btape?Ntx=mode%2Bmatchall