INSIZE digital 3-point bore gauge 50-100 mm IP65 kit (model 3127-1004)

The INSIZE digital 3-point bore gauge 50-100 mm IP65 kit (model 3127-1004) is a precision measuring instrument designed for accurate internal diameter measurement of holes, cylinders and bores in metalworking and inspection settings. The tool features a digital readout for direct numerical readings, three contact points for stable centering and a rugged design with IP65 dust and water resistance. Supplied as a complete kit, it is intended to streamline internal measurement tasks where repeatability and traceability are important.

Advantages

The digital display provides clear, immediate readings to reduce interpretation errors and speed up inspection cycles. The three-point contact mechanism ensures reliable centring and improved measurement stability compared with two-point gauges. IP65-rated protection increases durability in workshop environments by resisting dust ingress and low-pressure water jets. Delivered as a kit, the gauge includes the necessary interchangeable anvils and a carrying case for organized storage and transport.

Suitable for

• Inspection of internal diameters of holes, bores and cylinders in metalworking
• Quality control and incoming inspection of machined parts
• Dimensional checks in toolrooms and production lines
• Maintenance and verification of engine cylinders and hydraulic components

When it may not be suitable

This instrument is intended for internal measurements within the 50–100 mm range; it is not suitable for outside diameter, depth, or very small internal features outside that span. For use in extremely wet conditions, submerged environments or where full industrial washdown is required, higher ingress protection or specialised waterproof housings may be necessary.

Key specifications

• Measuring range: 50–100 mm
• Measurement system: digital 3-point contact
• Protection class: IP65 (dust tight and protected against water jets)
• Display: digital readout for direct numerical values
• Supply format: supplied as a kit with interchangeable anvils and storage case

How to use

Select the appropriate anvil or extension for the bore size within the 50–100 mm range and assemble the gauge according to the kit instructions. Insert the gauge into the bore and rock it gently until the three measuring contacts stabilise against the internal surface; read the measurement directly from the digital display. For best accuracy, perform measurements at consistent seating pressure, take multiple readings at different axial positions if required, and zero or calibrate the instrument on a reference standard before use.

What to consider before purchase

• Required measuring range and whether 50–100 mm covers the parts you inspect
• Needed accuracy and resolution for your quality standards
• Environmental conditions in the workshop and whether IP65 protection is sufficient
• Compatibility with existing calibration procedures and availability of calibration standards

Usage recommendations

Store the gauge and accessories in the supplied case when not in use, protect the measuring contacts from shocks and contamination, and follow regular calibration intervals. Use clean, dry bores and avoid excessive lateral forces while measuring to preserve accuracy and extend service life.