The invention discloses the survey meter for detecting the buried wiring. In the survey meter, the detecting head with coil L receives the weak magnetic field generated by the buried wiring and existed around, producing the induction current caused by the electromagnetic induction. With being through the resistance RI, the induction current is magnified by the operatinoal amplifier LCI. Then, with being rectified and filtered by the rectification-filtration circuit D, the current is output to the indicator. The said induction current is large eough to provide power for the indicator. The correct position of the buried wiring is determined by the yawing moment so as to keep away from the position of the buried wiring. Thus, the safety of the construction is guaranteed. |