Application:  Widely used in production site to measure surface roughness of various machinery-processed parts, calculate corresponding parameters according to selected measuring conditions and clearly display all measurement parameters.    Features:  * Be compatible with four standards of ISO, DIN, ANSI and JIS.  * Multiple parameter measurement: Ra, Rz, Rq, Rt.  * Highly sophisticated inductance sensor.  * Four wave filtering methods : RC, PC-RC, GAUSS and D-P.  * Built-in lithium ion rechargeable battery and control circuit with high capacity.  * Small in size, light in weight and easy to use.  * Manual or automatic shut down.  * Can memorize 7 groups of measurement results and measuring conditions for later use or download to PC.  * Metric /Imperial Conversion.  * Use USB/RS-232 data output to connect with PC.  * Provide Bluetooth data output choice.     Principle:  When measuring the roughness of a surface, the sensor is placed on the surface and then uniformly slides along the surface by driving the mechanism inside the tester. The sensor gets the surface roughness by the sharp built-in probe. This roughness causes displacement of the probe which results in change of inductive amount of induction coils so as to generate analogue signal, which is in proportion to the surface roughness at output end of phase-sensitive rectifier. The exclusive DSP processes and calculates and then outputs the measurement results on LCD.  Specifications:       Standards    GB/T6062,ISO4287,DIN4768,JIS B,ANSI46.1        Parameters    Ra,Rq,Rz,Rt        Measuring Range             Ra,Rq:0.005~16.00µm Rz,Rt:0.020~160.0µm                   /0.020~629.9µinch      /0.078~6299µinch            Accuracy    <<±10%        Fluctuation of Display Value    <<6%        Resolution    0.001/0.01/0.1        Sensor    Radius of Probe Pin    5µm        Material of Probe Pin    Diamond        Measurement Force of Probe    4mN(0.4gf)        Probe Angle    90º        Vertical Radius of Guiding Head    48 mm        Maximum Driving Stroke    17.5mm/0.7inch        Cutoff length(l)    0.25mm,0.8mm,2.5mm        Driving Speed    Sampling    When Length=0.25mm,Vt=0.135 mm/s        When Length=0.8mm,Vt=0.5mm/s        When Length=2.