i recently got a new 3D printer and it came with a strange part that wasn’t listed on the purchase? It says Roko Sn04-n and under that Bn-10~30v, bk-npn.no, Bu-0v
Xeno
2
And you didn’t try Google ?
you are doomed 
That looks like an inductive Z-probe used for automatic bed tilt compensation (also called auto bed levelling).
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