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.

　　3m Dynatel 2273M/2273M-id advanced cable/pipeline/fault/Marker locator. Used for detecting the direction and depth of underground electrical (optical) cables and pipelines, the transmitter can transmit signals of four different frequencies separately or simultaneously to suit the requirements of different detection distances, cable/optical cable and soil etc. . The receiver provides three positioning modes, can measure the buried depth of electrical (optical) cable and its relative signal current intensity, and can detect electrical signals of 50 or 60 Hz. Can transmit a single signal sound for line pair and cable/optical cable identification, waterproof and shockproof, equipped with cigarette lighter power interface, detectable 3M electronic identifier (only 2273M-iD)