000-120 2B Plug Gage NS stands for (American) “National Standard” miniature Thread series. This gage is one piece handle containing Go & No-Go members Precision Thread Gage made of High Speed Steel then hardened. Standard fit is 2B tighter 3B gages are made to order. Picture is representative of part, Brand is;" MiniTaps" made specifically for us in Switzerland.
We have a long form cert available on this gage for an additional charge.