6-8mm Three-Point Internal Micrometer With Digital Readout, Measuring Drum With Scale, IP65 - Metav IndustryLine

Take advantage of the combination of precise micro-range measurement, robust IP65 protection and a clear digital readout for reliable internal diameter checks. Benefit from the three-point measuring principle, 0.001 mm resolution and practical accessories; order the set directly via Metav Werkzeuge or consult our specialists for application advice.

Three-point internal micrometer set M312.230.M – digital, 6–8 mm range, IP65

Three-point internal micrometer set M312.230.M designed for accurate internal diameter measurement in blind holes and small bores, ideal for fine mechanical and precision workshop use

• Three-point measuring principle for stable contact
• Digital display with ABS/INC/UNIT keys
• 0.001 mm resolution for sub-millimetre control
• Supplied with setting ring and extension

Compact precision for micro components

This set is classified in the Micro category (measuring range 6–8 mm) and is optimised for the smallest internal diameters where stiffness and repeatability matter. The three-point measuring principle ensures centralised contact with the bore, reducing tilting and eccentricity that occur with two‑point systems; the result is a reproducible measurement that is easier to interpret and compare. With a stated accuracy of ±0.004 mm and a reading step of 0.001 mm, this rig is suitable for fine mechanical work, miniature assemblies and any application where tight internal tolerances are critical.

Clear, robust digital readout built for the workshop

The electronic head features a digital display with ON/OFF/SET and ABS/INC/UNIT functions for fast zeroing, incremental work and unit switching. The scale and vernier surfaces are matt‑chrome plated for glare reduction and long‑term legibility, while the spindle and drum provide tactile control during adjustment. The instrument carries an IP65 rating, protecting the electronics against dust and splashing water so that measurements remain reliable even in demanding production environments; the solid build and a compact mass of 0.7 kg combine for comfortable handling during repeated checks.

Ready-to-use accessories and standards compliance

Delivery includes a setting ring and an extension (100xØ5.7) for adapting the instrument to blind holes and awkward depths, enabling direct transfer of standards to the measuring heads. The design complies with DIN 863, so the set fits established workshop procedures and inspection routines. A measuring drum with integrated scale supports visual cross-checks alongside the digital readout, offering a fallback should batteries be depleted and supporting traceable routine checks without specialised test equipment.

Efficiency, trust and practical benefits for everyday metrology

The compact internal micrometer set accelerates in‑process inspection cycles: faster readings, reduced re‑set time and fewer re‑measurements translate into less downtime and more consistent quality control. The robust head and digital interface simplify documentation and quick pass/fail decisions on the shop floor, while the three-point geometry reduces operator influence on the result. Supplied as a complete kit with extensions, it supports both bench inspection and on‑machine checks where access is limited.

Contact Metav Werkzeuge for tailored advice on using the Metav IndustryLine three‑point internal micrometer set M312.230.M or to confirm stock and delivery options

Technical data

• Article number: M312.230.M
• GTIN: 4054469156361
• Manufacturer: Metav IndustryLine

Facts

• Measuring range: 6–8 mm
• Resolution (reading): 0.001 mm
• Accuracy: ±0.004 mm
• Weight: 0.7 kg
• Protection class: IP65
• Standard: DIN 863

Special features

• Digital display with ON/OFF/SET and ABS/INC/UNIT keys
• Measuring drum with scale
• Scale and vernier matt‑chrome plated
• Supplied with setting ring and extension (100xØ5.7)
• Suitable for blind‑hole measurement
• Data output: RB 4.1

FAQ

How small a bore can be measured with this set?
The three‑point internal micrometer set covers a range of 6–8 mm, intended for very small internal diameters and micro‑components.

Is the instrument suitable for blind hole measurement?
Yes. The set is explicitly designed for blind holes and includes an extension to reach recessed bores.

What accuracy and resolution can be expected?
The instrument offers a resolution of 0.001 mm and an accuracy of approximately ±0.004 mm, appropriate for fine mechanical inspection.

Does the set include calibration or a certificate?
The standard delivery contains the micrometer set with setting ring and extension; calibration certificates are not automatically included unless specified at purchase.

Can the display work in harsh workshop conditions?
The digital head is rated IP65, providing protection against dust ingress and splashing water to maintain display function in typical workshop environments.

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