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With digital cameras and computers it is easy to take and keep photos to document our boats. If you are like me, a photo of a nut is not enough to show me what size wrench I need to loosen it.
This gave me the idea of putting a wrench on the nut or fitting when taking the photo.
Below is a photo of my water lift muffler with the drain plug which needs to be loosened to let the water out when the boat is hauled for the winter. Now before I start crawling into the cockpit locker and standing on my head I wouln't have to drag lots of wrenches with me "just in case".
My father has spent a lifetime making incredibly detailed scale models and he always sets a one inch wide tape measure in the photos of the full scale pieces he is trying to model. Even at a distance the one foot markings are clearly visible and in the closeups the inches are clear. He measures the graduations on the tape with a dial caliper, and the dimension of any specific piece in the same plane and using ratio and proportion with simple algibra, cross multiplies a result. I.E. if one inch measures 0.375" and the piece you are trying to dimension measures 1.031" then it would be 2 3/4" etc.