The present invention relates to a multi-functional portable geological survey tool used in the field for geological survey. The multi-functional portable geological survey tool is provided to solve the problem of having to prepare a litany of conventional tools to conduct a geological survey in the field. According to the present invention, the multi-functional portable geological survey tool comprises a compass, a longitudinal measurement tool, a magnetic detection tool, a loupe, and a rock size measurement tool in a single housing to enable the user to conduct various geological surveys with one tool.;COPYRIGHT KIPO 2016
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