Each micrometer is equipped with a series of Interchangeable anvils. Each anvil is marked to show its capacity and is fitted with an adjustable collar to prevent wear. Graduated in 0.01mm increments.
| Code | Range mm | Code | Range mm |
| 650381 | 0-100 | 650386 | 500-600 |
| 650382 | 0-150 | 650387 | 600-700 |
| 650383 | 150-300 | 650388 | 700-800 |
| 650384 | 300-400 | 650389 | 800-900 |
| 650385 | 400-500 | 650390 | 900-1000 |