• Heavy-duty box aluminum frame
• Machined working edges ensure maximum accuracy
• Ergonomic rubberized hand grips for great comfort
• Anti-slip and anti-shock end caps protect the frame
• Top read window simplifies readability
• Accuracy: 0.0005"/in. (0.5 mm/m)

| Part No | Size | Inner | Outer |
| 4101 | 600mm | 5 | 30 |
| 4102 | 800mm | 5 | 30 |
| 4103 | 1000mm | 5 | 20 |
| 4104 | 1200mm | 5 | 20 |
| 4105 | 1800mm | 5 | 15 |
| 4106 | 2000mm | 5 | 10 |