Pair the indicator with a height stand on a granite plate to scan multiple points across a surface or across paired faces. By zeroing at a datum and moving in a grid, you visualize high/low areas and quantify out‑of‑flat or out‑of‑parallel conditions. This method is fast, fixture‑light, and sensitive to subtle geometric errors—ideal for qualifying ground plates, tooling components, or precision housings before they cause alignment issues downstream.