What length in pixels does a Wings3D unit of measurement equate to?

[Fonte Boa]

If you will export an OBJ (for example, since i am not sure which format you will use to send your model to the destination app), click on the little rectangle side File|Export|Wavefront (OBJ), so that you can open the Export Options window and be sure Import Scale and Export Scale fields are set to "1.0". This way the object wont be redimensioned during export operation.

Be sure during Import operation in the destination app there wont be any alteration in the scale of the imported object.

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Exemplifying with 3dsmax, to which i usually transfer my models from WIngs daily, the situation is the same you asked about. User has to set which is the system unit to be adopt in any new project. In other words, in 3dsmax, user has to set what is the value of a single Unit (1 m, 1 inch etc).
So lets suppose you set in 3dsmax 1 unit = 1 cm.
Then you import a default Wings cube (2x2x2 wu, wings unit).
This cube will arrive there measuring 2x2x2 cm.
That is all, Nightwing.

I can suppose this is valid for other 3d softwares too.
Just be sure you didnt re-scale the object during the Export operation, as i said above.