Application field: widely used in gas, electric power, water conservancy, communications and other industries, from the ground trenchless accurate detection of underground electronic information marker equipment.

　　Scope of use : 1, directly buried non-metal gas pipelines and facilities must use electronic identification system; 2, directly buried metal gas pipelines and facilities according to the complexity of the use of electronic identification; 3, all underground gas pipeline all kinds of valves; 4, all invisible manhole cover or may be buried by municipal (road, green) manhole cover; 5, all underground gas pipeline non-man well turn; 6, all underground gas pipeline branch points, joints, such as tee and reducer joints, etc. . 7, all underground gas pipeline and other underground facilities at the intersection; 8. The two ends of a gas pipeline across a road, river, building, fence, or other public relations facility may be the two ends of a gas pipeline protection pipeline; 9. The highest and lowest position of a gas pipeline when the depth of the change is greater than 0.5 meters; 10. All pre-buried Gas Pipeline Ends; 11. Both ends of the underground pipeline laid by trenchless technology; 12. Repaired underground gas pipeline or joint (for marking Maintenance Information) ; 13. Other important underground gas facility points marked on all file drawings; 14. All areas identified by operators as requiring marking and precise positioning.