• A detection sheet lay only one line underground if you cover with the area that a warning sheet lays underground after harden the ground to a height ideal an above 60 centimeter vertical laying trouble, and added to a 10 centimeter to plumbing width to 2line or 3line according to relation of a laying tube, and do on principles. 

• A warning sheet connects exactly a copper wire at the branch which plumbing, valves and test box intersects, and you shall do.

• It is an easy product to detection which use as connect a copper wire to a valve (a manhole) or test box after laying as attach a copper wire or aluminum on a warning sheet even if you do not attach a separate rocketing wire or magnetic substance in plumbing. 

• It is a product for other detection and the product which are available as mix, also because it does not have a magnetic substance unlike magnet sheets.