The magnetic location equipment is engineered by the most experienced design and manufacturing team available in the nation today. ML-1 is a non-metered device (audio only). Use this equipment to find: Corner markers (iron or steel), Mag nails and PK nails, Valve and curb boxes, Iron and steel pipes, Well casings, Manhold & Utility Box Covers, Steel drums & tanks, Septic tank handles, Energized electric cables, Marker magnets, Unexploded bombs (UXO).