Want to make exact measurements on a model made from a curve

I I had to snap scale the width with a cube to get it to be exactly 2 blender units wide, but I can’t figure out the height. I want it to be a more round number like 0.3 blender units, and not 0.3454362 or whatever. I beveled it from a plane I made into a curve.

blob:https://imgur.com/ea2dbc98-7c3e-43a9-bbf4-c62466ee5bf3

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