Calibration method for 906-10247-3 loop resistance tester

[Kyoungmin Kim]

Anybody have experience in calibration for 906-10247-3 loop resistance tester?
If I don't have cal std for 906-10247-3, how I calibrate it?
I have used some low resistance shunt, but I couldn't get right result at 10 milliohm.
I think the contact resistance value affects to result, I don't know how I remove it.
Plz help me.