... measurement: Ra, Rz, Rq, Rt 2)Highly sophisticated inductance sensor Surface Roughness Tester:1)Multiple parameter measurement: Ra, ... Rz, Rq, Rt2)Highly sophisticated inductance sensor1.FEATURESThis instrument is compatible with four standards of ... Fluctuation of display valueNot more than 6%SensorTest Principle: Inductance typeRadius of Probe Pin: 5Material of Probe Pin: ...