A specialized optical or measuring instrument designed to detect and measure deviations from a straight line, standard alignment, or proper course.
From Latin deviare (to turn from the path) + Greek skopein (to see/observe). The compound combines 'devia' (deviations) with '-scope' (viewing instrument).
A deviascope is a real tool used in engineering and surveying—it's essentially a precision instrument that makes visible what would otherwise be invisible deviations in alignment. Surveyors use them to check if buildings are leaning or if railroad tracks are properly aligned.
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