This is a spring-like mod for multimeters that can turn the regular probes into a tweezer-like probe. This is nice as it can free up a hand in some use cases. 

Insert the wires first into the slot then slide the mod down until the probes are tolerance fitted in the bigger holes.

This likely won't fit every probe set so the original .f3d and .3mf will be attached as well as the .stl.

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