I'm interested in buying a pocket penetrometer so I've been searching the web and found a dial penetrometer with the following description: "...used to evaluate the angle of internal friction “j” of sandy soil and the cohesion “c” in clay soils." I thought penetrometers were used only to obtain the unconfined compressive strength of clayey soils. Anybody has experience with this type of penetrometer and how reliable are the angle of friction values? The dial one if 6 times more expensive than the pocket one. Is it worth paying more?
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