What tool helps identify high and low spots?

What tool helps identify high and low spots?

• A. A hammer
• B. A caliper
• C. A straightedge or guide coat
• D. A pry bar

Answer: (C)

To detect high and low spots, you need a way to compare the surface to a flat reference and then see where it varies. A straightedge provides that reference; placing it on the panel and watching for rocking or gaps shows where the surface deviates, indicating highs or lows. A guide coat gives a visual map of unevenness: spray a thin contrasting layer and then sand or wipe it off. High spots will level off and reveal the bare surface first, while the coat remains in the low areas, making those depressions easy to spot. This approach gives you a clear picture of irregularities across the entire area. The other tools aren’t used for this inspection—hammers or pry bars shape or pry materials, and a caliper measures small dimensions at a single point rather than overall flatness.

To detect high and low spots, you need a way to compare the surface to a flat reference and then see where it varies. A straightedge provides that reference; placing it on the panel and watching for rocking or gaps shows where the surface deviates, indicating highs or lows. A guide coat gives a visual map of unevenness: spray a thin contrasting layer and then sand or wipe it off. High spots will level off and reveal the bare surface first, while the coat remains in the low areas, making those depressions easy to spot. This approach gives you a clear picture of irregularities across the entire area. The other tools aren’t used for this inspection—hammers or pry bars shape or pry materials, and a caliper measures small dimensions at a single point rather than overall flatness.