Caliper INSIZE SREDNICOWKA 3-point analog 125–150 mm model 3227-150

INSIZE SREDNICOWKA 3-point analog caliper model 3227-150 is a mechanical instrument designed to measure internal and external diameters of cylindrical parts within the 125–150 mm range. The tool uses three contact points to center on the measured surface, providing stable alignment for pipes, bearings and other round components. As an analog, non-digital device, it delivers direct mechanical readout suitable for workshop inspection and quality-control tasks where simple, robust diameter measurement is required.

Advantages

The three-point centering mechanism improves repeatability and alignment when measuring cylindrical objects compared with single- or two-point instruments. Its analog construction requires no batteries and offers straightforward maintenance and long-term reliability in typical workshop environments. The caliper’s range covers medium-large diameters common in pipework and bearing inspection, making it practical for routine checks and dimensional verification.

Suitable for

• Measuring internal diameters of pipes and tubes
• Checking bore and bearing diameters
• Inspecting round workpieces in production and repair shops
• Quality control and in-process inspection of cylindrical parts

Key specifications

• Measuring range: 125–150 mm
• Contact type: three-point centering contacts for stable alignment
• Display type: mechanical/analog readout
• Intended measurements: internal and external diameters of cylindrical components
• Typical applications: workshop inspection, dimensional checks, bearing and pipe measurement

How to use

Position the caliper so the three contact points engage the inner surface of the component to be measured or the outer surface for external diameters. Gently expand or contract the contacts until they make uniform contact and the centering action stabilizes the instrument. Read the measurement directly from the analog scale, ensuring the caliper is held steady and perpendicular to the axis of the measured part to avoid parallax or angular errors. For consistent results, apply consistent contact pressure and repeat measurements to confirm repeatability.

Usage recommendations

Before each measurement session, verify the instrument is clean and free of debris on the contact faces. Store the caliper in a protective case when not in use and avoid exposing it to excessive moisture or corrosive environments to maintain accuracy and extend service life.