Just a little idea I use, although I may teaching granny to suck the proverbial. The blade on my spade is 9 inches long, (230 mm), so I filed a small groove at 10", (255mm) - 12", (305mm) - 14" (355mm) - 16" (405mm) - 18" (460mm) on the front of the metal part which is 20" (510mm) long. Now when I dig a deep hole I can check how deep the artefact was. I put the metric in for those who do not use imperial. Best wishes to you all. Tony
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