... Tester: 1)Multiple parameter measurement: Ra, Rz, Rq, Rt 2)Highly sophisticated inductance sensor Surface Roughness Tester:1)Multiple ... parameter measurement: Ra, Rz, Rq, Rt2)Highly sophisticated inductance ... 10 mm LCD, with blue backlightParametersRa, Rz, Rq, RtMeasuring RangeRa, Rq: 0.005-16.00um/0.020-629.9uinch ...