Within metrology laboratories and precision inspection workshops, qualified reference measuring tools directly determine the reliability of dimension verification, workpiece inspection and equipment calibration results. Cast iron measuring tools are prone to rust, while ordinary stone measuring tools lack long-term stability. For a long time, metrology institutes and high-end manufacturers worldwide have been searching for metrology reference carriers featuring long-term stability, wear resistance and deformation resistance. Thanks to unique material properties, granite measuring tools have become the recognized standard carrier in the field of industrial metrology.
UNPARALLELED Group specializes in the manufacturing of ultra-precision non-metallic metrology components. We mass-produce various granite reference blocks for industrial metrology and accept custom machining of granite measuring tools in all specifications. Our product range covers standard metrology tools including granite surface plates, granite squares, granite straight edges, granite V-blocks, granite parallels and granite triangular squares. We also develop non-standard measuring tools according to customer drawings, including special-shaped products with mounting holes, slots and embedded thread sleeves, suitable for multiple scenarios such as laboratory calibration, CMM matching, optical equipment calibration and on-line workpiece inspection.
Raw material quality forms the foundation for the long-term stability of metrology references. Some suppliers in the market confuse stone materials and use porous marble to replace measuring-grade granite. No obvious defects can be observed in short-term testing, yet deformation tends to occur under temperature fluctuation and continuous load over time, leading to distorted metrology data. We exclusively adopt self-developed UNPARALLELED® high-density black granite raw material with a density of approximately 3100kg/m³. It features compact and uniform internal structure, low thermal expansion coefficient and excellent damping performance. Its physical properties outperform equivalent black granite from Europe and America, eliminating metrology errors caused by inherent material defects from the source. All raw materials undergo sufficient aging treatment to release internal stress, ensuring the measuring tools resist deformation after years of service.
Unlike ordinary stone processing factories that merely conduct cutting and polishing, metrology-grade granite measuring tools impose strict requirements on grinding technology and production environment. Our group operates two major production plants covering 200,000 ㎡, together with a dedicated stone storage yard. The Class 10,000 constant-temperature, constant-humidity dust-free workshop is equipped with anti-vibration trenches and silent overhead cranes to isolate interference from vibration as well as temperature and humidity fluctuations. Multiple large advanced grinding machines are deployed in the workshop, operated by senior craftsmen with over 30 years of hand-grinding experience, enabling stable machining of nanometer-level flatness. Our team is proficient in global metrology standards including German DIN, American ASME, Japanese JIS, British BS and Chinese GB standards. We can manufacture products according to customer-specified accuracy grades: Grade 0, Grade 00 and Grade 000.
A comprehensive and reliable inspection system strongly supports the credible precision of granite measuring tools. We uphold the manufacturing philosophy: "If you can measure it, you can produce it". We are equipped with world-class metrology instruments from Mahr (Germany), Mitutoyo (Japan), WYLER (Switzerland), Renishaw (UK) and other brands. All testing instruments hold valid calibration certificates issued by provincial and national metrology institutes with fully traceable testing data. Every batch of delivered granite reference blocks and measuring tools undergoes a complete geometric precision inspection. Formal inspection reports can be provided upon request to facilitate incoming inspection and system audit for overseas metrology institutes and factory laboratories. 
As one of the few precision component manufacturers in the industry holding ISO9001, ISO14001, ISO45001 and CE certifications simultaneously, UNPARALLELED has registered more than 20 international trademarks and technical patents across the EU, the United States and Southeast Asia. We maintain long-term technical exchanges with metrology institutes worldwide, the National University of Singapore, Nanyang Technological University and top domestic universities, continuously optimizing processing techniques and inspection solutions for granite measuring tools. Our products are supplied in bulk to multinational corporations such as Samsung, Bosch, SCHUNK and Apple, and exported to numerous countries across Southeast Asia, Europe and America.
We provide one-stop machining solutions whether you are a metrology institute purchasing standard reference blocks, an inspection equipment enterprise sourcing matching granite measuring tools, or an enterprise requiring custom stone reference components for automated production lines, laser equipment and new energy inspection projects. Benefiting from our geographical advantage close to Qingdao Port, we can efficiently arrange container shipment and shorten delivery cycles for overseas clients.
No compromise can be made for metrology references. UNPARALLELED always adheres to our commitment to customers: No cheating, No concealment, No misleading. We firmly reject shoddy substitutes and implement strict ultra-precision manufacturing standards on every granite measuring tool. In the future, we will continuously expand production capacity for diversified ultra-precision components including precision granite, precision ceramics, mineral castings and carbon fiber precision beams. We aim to deliver stable and cost-effective custom metrology reference solutions for the global metrology industry and high-end intelligent manufacturing sector.