I recall in UDK that I could set the desired pixels per meter texture density, and then there was a render mode that displayed each asset's density in shades blue-green-red. Is there something similar in UE4?
There isn't really a great/easy way of doing this by default but you can create a material library of texel density materials to put on your objects in your scene to reference to.
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https://www.youtube.com/watch?v=wKDlJUlzFoA