Soil compaction testing.
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Previously:
https://www.homemadetools.net/forum/...059#post199150
https://www.homemadetools.net/forum/...331#post200224
https://www.homemadetools.net/forum/...944#post198752
https://www.homemadetools.net/forum/...276#post176982
https://www.homemadetools.net/forum/...557#post151486
