Shouldn't have to say this, but pressing a ruler on the side of your penis isn't a accurate measurement neither is starting at 1 inch. : r/bigdickproblems
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Measure on a ruler not starting at 0 - YouTube
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Start-Rite Small Childrens Measuring Gauge - Accessories from Charles Clinkard UK
Startrite Large Childrens Measuring Gauge | Charles Clinkard
REEKON Tools Digital Tape Measure, Start measuring from any point on your tape measure without worrying about where to zero from, By Reekon Tools, Reekon Tape Measure - valleyresorts.co.uk