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To visualise the measuring process, try adding a spline component to whichever object is responsible for the measuring. Splines do not have rendering capability so you will need to create a mesh and use it as splinemesh. Make sure both are movable:
I’ve been using a mesh like this and it has served me well, ensuring the beam is visible from every angle:
You will also need a material for the Splinemesh itself: 2-Sided, Additive, used with Spline Meshes. Assign the material to the Splinemesh component visible in the screenshot above.
As default, splines have point 0 and 1. Place point 0 at start location and point 1 at the current hit vector produced by the laser (I’m assuming you’re tracing every frame). The Splinemesh does not automagically follow the spline, it needs to be updated:
