Tile-Gap Measurement Tool
Hand-held tool measures small gaps between tiles rapidly and accurately, even when gap is tapered or indented below surface. Tool indicates gap dimensions on calibrated disk. Measurements are accurate within plus or minus 0.003 inch. Tool was developed for determining gap between tiles on Space Shuttle, but may be of use in other applications requiring precise setting of gaps between tiles or other structures.
Helman, D. H.↗