... Ra, Rz, Rq, Rt 2)Highly sophisticated inductance sensor Surface Roughness Tester:1)Multiple parameter measurement: Ra, Rz, Rq, Rt2 ... is compatible with four standards of site to measure surface roughness of variousmachinery-processed parts, calculate corresponding and clearly display ... all measurement parameters.When measuring the roughness of a surface, the sensor is placed on the ...