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By certification 
Drilling Tool
Luhai non-magnetic drill collars are made from non-magnetic materials with low-magnetic permeability. API monogram, serial number, OD,ID, type and size of connections are stamped on recessed mill flats.
Magnetic Properties of Non-magnetic Drill Collar
When MPS=1×105/4πA/m
Relative magnetic permeabilityμr≤1.1010
Magnetic Field Gradient△B≤0.05μT
Luhai non-magnetic drill collars are made from non-magnetic materials with low-magnetic permeability. API monogram, serial number, OD,ID, type and size of connections are stamped on recessed mill flats.
Magnetic Properties of Non-magnetic Drill Collar
When MPS=1×105/4πA/m
Relative magnetic permeabilityμr≤1.1010
Magnetic Field Gradient△B≤0.05μT
