Resolution: 0.001mm/0.00005 inches
Button Functions: Power On/Off, Zero Set, Unit Toggle (mm/inch), Absolute/Incremental Measurement
Data Output: Not available
Power: Uses LR44 Battery with Automatic Shutdown feature
Measuring Faces: Made from durable Carbide
Adjustment: Equipped with a Friction Thimble for precise control
Anvil: Comes with a Spherical Anvil for versatile measurement
Calibration Standards: Provided for all sizes except the smallest range (0-25mm/0-1 inch)
Available Models and Specifications:
| Model Code | Measurement Range | Accuracy | Length (L) | Width (a) | Depth (b) |
| 3109-25A | 0-25mm / 0-1″ | ±2μm | 32mm | 6mm | 27.5mm |
| 3109-50A | 25-50mm / 1-2″ | ±2μm | 57mm | 8mm | 37mm |
| 3109-75A | 50-75mm / 2-3″ | ±3μm | 82mm | 8mm | 50mm |
| 3109-100A | 75-100mm / 3-4″ | ±3μm | 107mm | 10mm | 61mm |
| 3109-125A | 100-125mm / 4-5″ | ±3μm | 132mm | 10mm | 73mm |
| 3109-150A | 125-150mm / 5-6″ | ±3μm | 157mm | 10mm | 85mm |
| 3109-175A | 150-175mm / 6-7″ | ±4μm | 182mm | 21mm | 104mm |
| 3109-200A | 175-200mm / 7-8″ | ±4μm | 207mm | 21mm | 117mm |