Ten handheld measuring tools and their uses: Steel ruler, Tape measure, Vernier caliper, Outside micrometer, Engineer's square, Bevel protractor, Spirit level, Feeler gauge, Dial indicator, Thread pitch gauge. A thematic selection, not an accuracy ranking. Photographs of real instruments; the square and spirit level are illustrated with photorealistic AI-generated images. Photo credits: 1. File:All Millimetre Rule.jpg - Fredquint; CC BY-SA 4.0; https://commons.wikimedia.org/wiki/File:All_Millimetre_Rule.jpg; https://creativecommons.org/licenses/by-sa/4.0; scaled and letterboxed without cropping; rotated 90 degrees 2. File:Measuring-tape.jpg - Evan-Amos; Public domain; https://commons.wikimedia.org/wiki/File:Measuring-tape.jpg; scaled and letterboxed without cropping 3. File:Caliper full view.jpeg - Simon A. Eugster; CC BY-SA 3.0; https://commons.wikimedia.org/wiki/File:Caliper_full_view.jpeg; https://creativecommons.org/licenses/by-sa/3.0; scaled and letterboxed without cropping; rotated 90 degrees 4. File:Inch micrometer.JPG - Mauro Cateb; CC BY-SA 3.0; https://commons.wikimedia.org/wiki/File:Inch_micrometer.JPG; https://creativecommons.org/licenses/by-sa/3.0; scaled and letterboxed without cropping 6. File:Universal bevel protractor against blue background.jpg - Connie Posites; CC BY-SA 2.0; https://commons.wikimedia.org/wiki/File:Universal_bevel_protractor_against_blue_background.jpg; https://creativecommons.org/licenses/by-sa/2.0; scaled and letterboxed without cropping 8. File:Feeler gauge.jpg - Selit; CC BY-SA 3.0; https://commons.wikimedia.org/wiki/File:Feeler_gauge.jpg; https://creativecommons.org/licenses/by-sa/3.0; scaled and letterboxed without cropping 9. File:Dial Indicator Gauge.jpg - Solaris2006; CC BY-SA 3.0; https://commons.wikimedia.org/wiki/File:Dial_Indicator_Gauge.jpg; http://creativecommons.org/licenses/by-sa/3.0/; scaled and letterboxed without cropping 10. File:Gewindeschablone.jpg - Jahobr; CC0; https://commons.wikimedia.org/wiki/File:Gewindeschablone.jpg; http://creativecommons.org/publicdomain/zero/1.0/deed.en; scaled and letterboxed without cropping