Model:SRT62001.FEATURESThis instrument is compatible with four standards of ISO, DIN, ANSI and JIS and is widely used in production site to measure surface roughness of various machinery-processed parts, calculate corresponding parameters according to selected measuring conditionsand clearly display all measurement parameters.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. * Very easy to operate * Multiple parameter measurement: Ra, Rz* Highly sophisticated inductance sensor* Built-in lithium ion rechargeable battery and control circuit with high capacity* Small in size, light in weight and easy to use* Can communicate with PC computer for statistics, printing and analysing by the optional cable and the software for RS232C interface.*Manual or automatic shut down. The tester can be switched off by pressing the Power key at any time. On the other hand, the tester will power itself off about 5 minutes after the last key operation.2．SPECIFICATIONSDisplay： 4 digits, 10 mm LCD, with blue backlightParameters: Ra, RzDisplay Range Ra: 0.05-10.00um/1.000-400.0uinch Rz: 0.020-100.0um/0.780-4000uinchAccuracy: Not more than 10%Fluctuation of display value: Not more than 6%Sensor : Test Principle: Inductance type Radius of Probe Pin: 10um Material of Probe Pin: Diamond Measurement Force of Probe: 16mN(1.6gf) Probe Angle: 90° Vertical Radius of Guiding Head: 48mmMaximum driving stroke: 17.5mm/0.7inchCutoff length (l): 0.25mm / 0.8mm / 2.5mm optionalEvaluation length: 1~5 cut off optionalDriving speed: sampling length = 0.25mm Vt=0.135mm/s sampling length = 0.8mm Vt=0.5mm/s sampling length = 2.5mm Vt=1mm/s returning Vt=1mm/sResolution : 0.001μm if reading ＜10μm 0.01μm if 10μm≤reading＜100μm 0.1μm if reading ≥100μm Power Li-ion battery: rechargeableOperating conditions: Temp. 0-50℃ Humidity <80% Size：140x57x48 mm (5.5x2.2x1.9 inch) Weight: about 420 gAttachment:Standard Sensor RP-100Groove Stylus SRP-110curvature Probe SRP-120Extension Rod SER-150Mesurement Stand SRS-1Standard Sample Plate SSP-180Cable and Software for RS-232/USBBluetooth interface