8-10mm Three-Point Internal Micrometer Digital Readout, Measuring Drum Scale, IP65 - Metav IndustryLine

Take advantage of the combination of high-resolution measurement, rugged protection and compact design for reliable blind-hole inspection. Benefit from rapid digital readout, a finely scaled measuring drum and a complete accessories package; order directly via Metav Werkzeuge or consult our specialists for application advice.

Three-point internal micrometer M312.231.M — digital three-point internal micrometer, 8–10 mm, IP65

The Three-point internal micrometer M312.231.M is a compact digital gauge engineered for precise diameter measurement of blind holes in small components and precision assemblies.

• Digital display with ABS/INC/UNIT functions
• 0.004 mm accuracy for repeatable results
• IP65 protection against dust and splashes
• Includes setting ring and extension

Precision for tight tolerances in compact workpieces

This instrument belongs to the Micro measurement class (maximum range up to 10 mm), making it ideal where high accuracy on small parts is required. The drive mechanism delivers a stated accuracy of 0.004 mm, while the readout supports a fine resolution of 0.001 mm, so the gauge resolves micron-scale changes and records them reliably. The limited measuring span of 8–10 mm concentrates material stiffness and mechanical stability into a small footprint, which reduces bending and improves repeatability for watchmaking, toolmaking and other fine‑mechanics tasks.

Digital convenience and environmental robustness

A clear digital display with ON/OFF/SET and ABS/INC/UNIT keys simplifies measurement routines and mode switching, while the engraved measuring drum provides a backup scale for quick reference. Rated IP65, the instrument resists dust ingress and splash water, extending service life in workshop conditions. For integration into quality documentation, the device offers a data interface RB 4.1, supporting traceable transfer of measurement values into inspection systems. The scale and vernier are matt‑chrome plated, which reduces glare and makes graduations easier to read under workshop lighting.

Accessories, standards and practical handling

Delivery includes a precision setting ring and a 100×Ø5.7 extension, enabling reliable calibration and access to deeper blind bores without adapting multiple tools. The micrometer complies with DIN 863 standards for mechanical micrometers, ensuring familiar form and function for workshop technicians and inspectors. With a compact build and modest mass, the instrument sits comfortably in the hand for controlled application of measuring force, while the three‑point contact geometry stabilises the measuring span inside blind‑hole bores for more centred, repeatable readings.

For reliable blind‑hole diameters in precision workshops, rely on Metav IndustryLine quality — contact Metav Werkzeuge in Emmerich for tailored advice and fast, dependable supply via info@metav-werkzeuge.com or +49 2822 7131930

Technical Data

• SKU: M312.231.M
• GTIN: 4054469156378
• ECLASS: 21170335
• ETIM: EC003590

Facts

• Measuring range: 8–10 mm
• Accuracy: 0.004 mm
• Resolution: 0.001 mm
• Weight: 0.7 kg
• Length: 55 mm
• Protection class: IP 65
• Standard: DIN 863
• Data output: RB 4.1

Special features

• Digital display with ON/OFF/SET and ABS/INC/UNIT
• Measuring drum with scale
• Matt‑chrome plated scale and vernier
• Three‑point internal measuring geometry
• Suitable for blind‑hole (sackloch) bores
• Includes setting ring and extension (100×Ø5.7)

FAQ

How accurate is this internal micrometer?
The Three‑point internal micrometer M312.231.M achieves an accuracy of 0.004 mm, with a resolution of 0.001 mm, making it suitable for fine mechanical measurement tasks.

Can the instrument measure blind holes reliably?
Yes. The three‑point contact geometry and included extension are designed specifically to centre and stabilise measurements in blind‑hole bores.

Is the gauge suitable for workshop environments?
The device is rated IP65, providing dust protection and splash resistance, and the matt‑chrome scale improves legibility under workshop lighting.

What accessories are supplied with the micrometer?
Delivery includes a setting ring and a 100×Ø5.7 extension, allowing calibration and access to deeper blind bores without additional tooling.

Manufacturer / Responsible: Metav Werkzeuge GmbH; Parkring 45; 46446 Emmerich; Germany; +49 2822 7131930; info@metav-werkzeuge.com