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Model:SRT-6210
1.FEATURES
This instrument is compatible with four standards of site to measure surface roughness of various machinery-processed parts, calculate corresponding and 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 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.
* 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
* Can communicate with PC computer for statistics, printing and analyzing 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.
*The tester can memorize 7 groups of measurement results and measuring conditions for later use or download to PC.
*Metric /Imperial Conversion
2．SPECIFICATIONS
Display： 4 digits, 10 mm LCD, with blue backlight
Parameters:  Ra, Rz, Rq, Rt
Measuring Range
           Ra, Rq:  0.005-16.00um/0.020-629.9uinch
           Rz,Rt:   0.020-160.0um/0.078-6299uinch
Accuracy: Not more than ?0%
Fluctuation of display value: Not more than 6%
Sensor :
         Test Principle: Inductance type
         Radius of Probe Pin: 5um
         Material of Probe Pin: Diamond
         Dynamo-measurement of Probe: 4mN(0.4gf)
         Probe Angle: 90?
         Vertical Radius of Guiding Head: 48mm
Maximum driving stroke:  17.5mm/0.7inch
Cutoff length (l): 0.25mm / 0.8mm / 2.5mm  optional
Driving 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/s
Profile digital filter
         Filtered Profile:            RC
         Filtered Profile:            PC-RC
         Filtered Profile:            Gauss
         Non-Filtered Profile:        D-P
Resolution : .001μm    if reading ＜10μm
                      0.01μm    if 10μm≤reading＜100μm
                      0.1μm    if reading ≥100μm     
Evaluation length : 5 cut-off
Power Li-ion battery: rechargeable
Operating conditions:  Temp. 0~50℃
                       Humidity <80%
Size：140x57x48 mm  (5.5x2.2x1.9 inch)    
Weight: about 420 g