NASA NTRS · 19730010693
Self-recording portable soil penetrometer
Abstract
A lightweight portable penetrometer for testing soil characteristics is described. The penetrometer is composed of a handle, data recording, and probe components detachably joined together. The data recording component has an easily removed recording drum which rotates according to the downward force applied on the handle, and a stylus means for marking the drum along its height according to the penetration depth of probe into the soil.
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Costes, N. C., Sturm, R. G., Norton, R. H., Campbell, G. E.. 1973-01-23. Self-recording portable soil penetrometer. https://ntrs.nasa.gov/citations/19730010693
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