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The Apple Watch Ultra 3 and A3 Paper are most easily told apart by their overall size. On height, the A3 Paper measures 420.0 mm against the Apple Watch Ultra 3's 49.0 mm — about 371.0 mm more. On width, the A3 Paper measures 297.0 mm against the Apple Watch Ultra 3's 44.0 mm — about 253.0 mm more. On thickness, the Apple Watch Ultra 3 measures 14.4 mm against the A3 Paper's 0.1 mm — about 14.3 mm more.
Only the Apple Watch Ultra 3 lists a weight (61.4 g), so a direct comparison is not possible.
| Metric | Apple Watch Ultra 3 | A3 Paper | Diff |
|---|---|---|---|
| Width | 44.0 mm | 297.0 mm | -253.0 mm |
| Height | 49.0 mm | 420.0 mm | -371.0 mm |
| Depth | 14.4 mm | 0.1 mm | +14.3 mm |
| Weight | 61.4 g | N/A | - |