... Rz, Rq, Rt 2)Highly sophisticated inductance sensor Surface Roughness Tester:1)Multiple parameter measurement: Ra, Rz, Rq, ... with four standards of site to measure surface roughness of variousmachinery-processed parts, calculate corresponding and ... ion rechargeable battery and control circuit with high capacity* Small in size, light in weight ... inch) Weightabout 420 g SURFACE ROUGHNESS TESTER SRT-6210