Measurement instruments used in lapidary and gemmological practice. Stated precision and range are reproduced from manufacturer specifications.
| Product | Price | Range | Resolution | Accuracy |
|---|---|---|---|---|
| GemOro Carat Scale, USB Powered, 0.001 ct | $245 | — | 0.001 ct | — |
| Starrett Dial Caliper, 6 in | $245 | 0 – 6 in | — | — |
| iGaging Digital Caliper, 6 in | $38 | 0 – 6 in | 0.0005 in / 0.01 mm | — |
| Mitutoyo Digital Caliper, 6 in · 500-196-30 | $162 | 0 – 6 in / 0 – 150 mm | 0.0005 in / 0.01 mm | ±0.001 in |