1.  Metal shell, pocket size

2.  Ra, Rz, Rq and Rt 4 parameters in 1 instrument

3.  Protective shield for protectiong sensor from damage

4.  Work on li-on rechargeable battery with long working time

1.  20 parameters: Ra, Rz, Rq, Rt, Rp, Rv, R3z, R3y, Rz(JIS), Rs, Rsk, Rsm, Rku, Rmr; Ry(JIS)=Rz, Rmax=Rt, RPc, Rk, Rpk, Rvk, Mr1 and Mr2

2.  Compatible with 4 standards of ISO, DIN, ANSI and JIS

3.  4 filtering mothods of RC, PC-RC, GAUSS and D-P

4.  Built-in li-on rechargeable battery, up to 20 hours continuous work