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→Measurement procedure
# Open the tube until the paper is in contact with the sidewalls of the test hole, then roll the top of the tube over to stiffen it.
# Open the tube until the paper is in contact with the sidewalls of the test hole, then roll the top of the tube over to stiffen it.
# After placing the tube in the hole, place the plastic marker and add the base gravel layer.
# After placing the tube in the hole, place the plastic marker and add the base gravel layer.
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