5 in stock
Original price was: ₹200,000.00.₹175,000.00Current price is: ₹175,000.00. + 18% GST extra
1 in stock
Original price was: ₹1,200,000.00.₹1,000,000.00Current price is: ₹1,000,000.00. + 18% GST extra
A Ra Tester measures the surface roughness of machined parts. It focuses on the Ra value, which shows the average roughness of a surface. Industries use this device to check if the surface finish meets quality standards.
Technicians use Ra Testers in manufacturing, metalworking, and machining. These testers help ensure product quality and performance. Most models come with a digital display and support for Bluetooth or app control.
A Ra Tester offers quick and accurate readings. It makes surface testing easy and portable on shop floors and in the field. Learn more in our What is an Ra Tester? guide
A Ra Tester uses a stylus-type sensor or non-contact optical sensor. The sensor moves over the surface and records vertical deviations. The tester converts these deviations into numerical roughness values, including Ra, Rz, Rt, and more. The Ra value represents the average height difference between peaks and valleys on the surface. Modern testers display results digitally and often support Bluetooth or app connectivity for easy analysis.
Manufacturing: Check surface finish of machined parts and components.
Automotive: Measure roughness of engine parts, brake discs, gears, etc.
Aerospace: Ensure critical components meet strict surface specifications.
Metalworking: Monitor surface texture during grinding, milling, or polishing.
Plastic Molding: Assess mold finishes for accurate part replication.
Quality Control Labs: Use in R&D and final inspection of parts.
Construction Materials: Test surface finish of metals, ceramics, or composites.
A Ra Tester ensures the quality and performance of machined parts by accurately measuring surface roughness. It helps detect tool wear, machining defects, or inconsistencies during production. By providing precise Ra values, the tester supports compliance with international standards such as ISO, JIS, DIN, and ANSI. Its portable design and real-time digital output make surface roughness measurement fast, reliable, and ideal for on-site inspections and quality control.
Ra Testers are available in different types based on their sensing technology and form factor. The most common is the contact stylus type, which uses a diamond-tipped stylus to trace the surface and measure roughness with high accuracy. In contrast, non-contact optical types use advanced methods like laser triangulation or white-light interferometry to scan surfaces without physical contact—ideal for delicate or soft materials. Ra Testers also come in portable and benchtop models. Portable models are lightweight, battery-operated, and perfect for on-site inspections, while benchtop models offer higher precision and are best suited for laboratory or production line use where accuracy and repeatability are critical.
Using a Ra Tester effectively involves following a few essential steps to ensure accurate and consistent results. Start with a step-by-step usage guide, which typically includes powering on the device, selecting the measurement parameter (such as Ra or Rz), and choosing the appropriate filter settings. Proper probe placement and alignment are crucial—ensure the stylus is perpendicular to the surface and positioned on a clean, flat area free from dust or oil. Before measurement, perform a calibration procedure using the provided reference specimen to verify accuracy. Once the test is complete, review the results and understand the data interpretation, which includes analyzing roughness values, profile graphs, and tolerances. Regular upkeep is essential, so follow a simple maintenance checklist that includes cleaning the stylus, checking battery levels, and updating software if needed. This routine ensures long-term performance and reliable readings from your Ra Tester.
A Ra Tester for metal is essential for measuring the surface roughness of machined, ground, or treated metal components. Whether you’re inspecting stainless steel, aluminum, or hardened alloys, a surface roughness tester helps determine if the finish meets functional and aesthetic requirements. It accurately measures parameters like Ra, Rz, and Rt, ensuring consistent quality, detecting tool wear, and preventing surface defects in industrial manufacturing. Portable Ra testers like the MR-RT25D are ideal for on-site inspections, offering high precision and compliance with standards like ISO 4287 and JIS B601. This makes them perfect for automotive, aerospace, metal fabrication, and toolmaking industries.
Choosing the right surface roughness tester depends on your application, material type, and accuracy needs. Start by identifying which roughness parameters you need, such as Ra, Rz, or Rt. For general machining, an Ra tester with portable design and multiple filter options works best. If you’re testing delicate or curved surfaces, look for a tester with specialized probes and non-contact measurement. Always check the tester’s measurement range, resolution, and compliance with ISO or JIS standards. Choose models with Bluetooth or USB data transfer if you need quick reporting. A reliable surface roughness tester improves quality control and helps you meet production standards. METERDI is ra tester manufacturer in India.
The METERDI Ra Tester MR‑RT25D achieves high-precision measurements thanks to its advanced design:
Offers an accuracy of ±(5 nm + 0.1 × Ra of calibration block)
It maintains excellent repeatability—variation stays within 3% across multiple measurements.
Utilizes a natural-diamond stylus with a 5 µm tip and <4 mN contact force, reducing the risk of surface damage.
Supports four profile filters (Gauss, RC, PC-RC, D‑P) and measures over 20 parameters, making it versatile for different testing standards.
In summary, the MR‑RT25D matches or exceeds many benchtop models in both accuracy and repeatability, making it a reliable choice for precise roughness monitoring in field and shop-floor environments.
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