High-Precision Circometer (π Ruler) for Measuring Pipe Diameters

The High-Precision Circometer (also known as the π ruler) is designed for precise measurement of the average diameter of round workpieces, especially plastic pipes and fittings. It offers both diameter and perimeter readings in one tool. Made from flexible stainless or spring steel, the ruler is durable, with engraved numbers that remain clear throughout usage. Its high accuracy and ease of use make it ideal for professional applications in measuring large or thin-walled pipes.

Categories: Testing by Material, Plastic Testing

High-Precision Circometer (π Ruler) for Measuring Pipe Diameters

Features

Flexible Steel Band: Made of stainless or spring steel for longevity and reduced internal stress.
High Precision: Measurement error reduced to 1/π, providing greater accuracy for large diameters beyond φ500mm.
Dual Measurement Function: Reads both diameter and perimeter.
Magnetic Bridges: Enables easy measurement of large diameters by a single person.
Durable Engraving: Numbers are engraved on the steel for long-term readability.
Avoids Workpiece Distortion: Thin workpieces can be measured without distortion.

Specifications

Graduation Value (Main Ruler): 0.5 mm
Graduation Value (Secondary Ruler): 0.02 mm
Applicable Standards:
GB/T8806-1988 (Plastic Pipe Material Size Measurement Technique)
ISO 3126 (Plastic Pipe Material – Size Measurement)
Material: Stainless steel or spring steel
Accuracy: Suitable for diameters beyond φ500mm, especially effective above φ1000mm