Surface Roughness Comparator RU130

Why choose roughness comparator RU130:

The RU130 Surface Roughness Comparator by Rubert is a must-have tool for machinists, quality inspectors, and engineers. Made in the UK, it features 30 finely crafted surface samples. By running your fingernail or a stylus across the samples, you can compare a workpiece to the standards and visually and tactilely evaluate whether it meets the required finish specification It’s suitable for turning, milling and grinding operations, and complies with international roughness standards. Portable, durable, and easy to use in any inspection setting. Note item is for comparison purposes only and if require to measure actual Ra value, can refer to surface roughness tester such as Mitutoyo SJ series.

Roughness comparator Features:

Roughness comparator equivalent to SPI30-695-1
This set consists of 30 comparison specimens, covering six of the most commonly-used machining methods: 6 cylindrically turned, 6 end-milled, 6 horizontally milled, 6 surface-ground, 3 lapped, 3 reamed/drilled.
checking roughness of turned, milled, ground, reamed, polished or lapped parts during machining
checking the roughness of spark-eroded surfaces as described in the VDI 3400 Guideline
checking the roughness of steel surfaces which have been prepared for painting by blast-cleaning, as outlined in ISO 8503
estimating surface roughness prior to accurate measurement by a stylus instrument, as recommended in BS EN ISO 4288,
checking the seriousness of damage to parts caused by nicks, dents and scratches
checking reconditioned ship propeller blades

By allowing quick and reliable visual and tactile comparison of surface finishes, the RU130 Surface Roughness Comparator remains a trusted standard for machinists and inspectors worldwide. It bridges the gap between quick, on-the-fly surface checks and high-end measurement tools—making it a smart, reliable, and budget-friendly investment for any precision engineering team.

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