What is the meaning of ra tester
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mean roughness value
Roughness Tester. ... A roughness tester is used to quickly and accurately determine the surface texture or surface roughness of a material. A roughness tester shows the measured roughness depth (Rz) as well as the mean roughness value (Ra) in micrometers or microns (µm).
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what is the ful form of RA tester
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