Precision Granite Square Ruler Set with Aluminum Case

This product is a precision granite square ruler set designed for high-accuracy measurement and alignment tasks in precision machining and metrology environments.

From the image, the set is packaged in a professional aluminum carrying case with custom precision foam, designed to protect each granite square ruler during transportation and storage. The foam insert contains four dedicated slots, ensuring that every square ruler is securely positioned and protected from vibration or impact.

Each ruler is manufactured from high-density ZHHIMG® black granite, known for its exceptional dimensional stability and vibration-damping properties. The matte precision-lapped surface indicates ultra-fine grinding and hand finishing, which ensures high measurement accuracy.

Granite square rulers are widely used in precision inspection, machine assembly, metrology laboratories, and equipment calibration, where strict right-angle accuracy is required.

Compared with steel or cast-iron squares, granite squares provide better thermal stability, corrosion resistance, and long-term accuracy, making them ideal for demanding industrial environments.