ZHHIMG® Ultra-Precision Granite Straight Edge

While many manufacturers utilize standard marble or lower-density stone, ZHHIMG® exclusively uses our proprietary deep-earth black granite.

•   Superior Density: With a density of approximately 3100kg/m³, our material significantly outperforms European and American black granite in terms of physical stability.
•   Natural Aging: Our granite undergoes thousands of years of natural seasoning, ensuring internal stresses are non-existent. This means your measurements won't drift over time due to material warping.
•   The "Walking Electronic Level": Every straight edge is finished by our master technicians, many of whom have over 30 years of manual lapping experience. They achieve sub-micron precision that machines simply cannot replicate—a craft we refer to as "lapping to the nano-level by hand."

Key Technical Specifications & Features

•   Standard Compliance: Produced and inspected according to global standards including DIN 876/875, ASME GGG-P-463C-78, and JIS B7513.
•   Exceptional Flatness: Available in Grade 00 and Grade 000, with flatness and straightness tolerances reaching the 1μm (micron) level.
•   Zero Corrosion & Magnetism: Unlike steel equivalents, our granite rulers are 100% rust-proof and non-magnetic, making them ideal for sensitive electronic and semiconductor environments.
•   Thermal Stability: A very low coefficient of thermal expansion ensures accuracy remains consistent even with slight temperature fluctuations in the workshop.