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A novel ring heat source probe based on three‐dimensional transient heat conduction from a point heat source is applied to measure in situ wall‐rock thermal conductivity in mine pits. The calibration is based on two reference materials. The data are processed digitally, using an acoustically controlled channel selector. The application of a fully automatic control technique by a microcomputer program results in successful establishment of a quick and portable one‐button triggering, in situ wall‐rock thermal conductivity meter for mine pits.