Multiple parameter measurement:Ra, Rz, Rq, Rt. Support RS232C interface. I.Product Name:Surface Roughness Tester( ... clearly display all measurement parameters.Multiple parameter measurement: Ra, Rz, Rq, RtHighly sophisticated inductance sensorFour wave filtering methods : RC, PC-RC ... , 10 mm LCD, with blue backlightParameters: Ra, Rz, Rq, RtMeasuring Range Ra, Rq: 0.005-16.00um/0.020-629.9uinch Rz ...