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0-25mm 0-1" Digital Outside Micrometer - 3109 Series (Insize)
| Range (mm) | 0-25 |
| l | 32 |
| a | 6 |
| b | 27.5 |
| Accuracy | ±0.002mm |
| Resolution | 0.001mm/0.00005 |
Learn more about Klarna
The Insize 3109 Digital Outside Micrometer delivers fast, precise measurements for machinists, quality control professionals, and workshop technicians who value reliability and ease of use. Designed for one‑hand operation with a ratchet thimble, it combines a streamlined digital readout with durable carbide faces to handle repetitive gauging tasks with confidence.
- Resolution: 0.001 mm / 0.00005" for dependable, fine measurements
- Measurement range: up to 100 mm (4") to cover a wide range of small to mid-sized parts
- Carbide measuring faces: wear‑resistant and long‑lasting for repeated use
- Digital display: clear, immediate readings that minimize parallax errors
- Unit and mode controls: easy on/off, set, mm/inch, and ABS/INC for flexible workflows
- Ratchet thimble: consistent measuring force and comfortable one‑hand operation
- Spherical anvil: enables stable contact on curved or irregular external surfaces
- Battery compatibility: powered by SR44 or LR44 batteries for convenient replacement
- Calibration support: includes setting standards to verify accuracy straight out of the box
This digital outside micrometer helps you speed up inspection routines without sacrificing accuracy. The carbide faces resist wear for longer life, while the spherical anvil expands the range of measurable shapes. With metric and imperial options, as well as a reliable ABS/INC measuring mode, it integrates smoothly into any shop that switches between measurement systems. Calibrate with the included standards to maintain consistent performance across your production or quality assurance processes.
| Range (mm) | 0-25 |
| l | 32 |
| a | 6 |
| b | 27.5 |
| Accuracy | ±0.002mm |
| Resolution | 0.001mm/0.00005 |
| Read Out | Digital |
| mm or Inch | mm|inch |
| Data Output | Yes |
| Individual or Set | Individual |
What time are Protool open?
We are open Monday to Friday between 8:30am and 5pm.
Do you offer Free Next Day delivery?
Yes! We offer Free Next Day delivery via Royal Mail Tracked 24 on all orders over £50 ex VAT*. We also offer Free DPD Local Next Day delivery on all orders over £100 ex VAT*.
We also offer the following:
- Royal Mail Tracked 24 — £5.90 (FREE on orders over £50 ex VAT*). Order before 4:30pm for next day delivery. No signature required.
- DPD Local Next Day — £8.00 (FREE on orders over £100 ex VAT*). Standard next day delivery to UK mainland addresses.
- Royal Mail Special Delivery — £12.50. Guaranteed delivery before 1pm the next working day.
- DPD Saturday Delivery — £25.00. Must be ordered on Friday before 4pm. Pre-12pm delivery.
For delivery to Scottish Highlands & Islands, Northern Ireland, Republic of Ireland, or overseas locations, additional charges apply. Please see our delivery page for full details, or call us on 01732 887 334.
*T's & C's and exclusions apply. Please see our delivery page for more information on all our services.
Full Range: Digital Outside Micrometer - 3109 Series (Insize)
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