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Does anyone know where I can get something like a small buble level that I can place on a set of trucks (example below) and role it up a grade to tell me what the real grade is?

I recently got back in to model trains after a 38 year gap. I have started setting up a small track and am already starting to plan my new larger one but have a question in the meantime. Once I get my larger set up built I will have several hills rainging from 2% to 4% grade (I was told 4% was...