Landtek SRT6200 Surface Roughness Meter Gauge Tester Diamond Probe 0.05~10um Ra 100um Rz Compatible with four standards: ISO (International), ANSI (United States), DIN (Germany) and JIS (Japan) Multiple parameter measurement: Ra, Rz 4 wave filtering methods (RC, PC-RC, GAUSS & D-P) Switchable between Metric (m) and Imperial (inch) Highly sophisticated inductance sensor