Surface roughness- a measurement  of the texture of a surface. It is quantified by the vertical deviations of a real surface from its ideal form. If the deviations are large, the surface is rough, if they are small, the surface is smooth.

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Starrett SR100 Surface Roughness Tester


                              Starrett SR100


The SR100 portable surface roughness tester is powerful, accurate and easy to use.

 With the SR100, you can measure roughness almost anywhere. It is ideal for checking large components, structures, auditing batch production prior to shipment and production line process control.                                                                               

Separates into Two Pieces

The innovative SR100 separates into two pieces to measure surface roughness. The bottom half contains the traverse mechanism and stylus pick up assembly. This is placed on the surface to be measured. It has a wide base to ensure stability.

The upper half includes the large LCD display, start button, mode and parameter buttons, comfortably  hand held for easy operation and clear viewing.

How it does it                    

A diamond stylus is drawn across the part. The motorized traverse mechanism is cam driven to ensure that the correct horizontal distance is traveled.

Vertical movement of the stylus as it travels across peaks and valleys is detected by a piezo-electric pick up which converts mechanical movement into an electrical signal.

The electrical signal is digitized and sent to a microprocessor where the parameters are instantly calculated using standardized algorithms.

                                              small hand held Sr100


*Large LCD window


*Measures Ra at the touch of a button


*In addition to basic roughness parameter Ra and Rz, also measures advanced Rp, Rv, and Rt parameters


*five second cycle time


*Result saved until the next measurement is taken


*Switches between inch and metric mode without remeasuring


*Use right out of the box-little or no operator training required


*Automatic shut-off after five minutes of inactivity


*Configured with the most common industrial settings to ensure correlation between multiple operators (see specifications)


*Simple and reliable calibration routine


*Uses standard off-the shelf calculator type batteries with a minimum life of 5,000 measurements


*Includes SR100 two-piece assembly, calibration standard, batteries, operation guide and a carrying case









































                      Sr100 wi fi

                 sr100 dimensions


SR100 Surface Roughness Tester & Accessories

Cat. No.              EDP

SR100                 20950    SR100 two-piece surface roughness tester assembly,

                                     calibration standard, batteries, operation guide and a

                                     carrying case.

Technical Specifications  
Gauge range200m (0.008in)
Accuracy5% of reading + 0.1m (4in)
Pick up typePiezoelectric
Gauge force.007 oz.
StylusDiamond, Radius 5m (200in)
Cut off value0.03in + 15%
Traverse length5mm (0.2in)
Traverse speed0.08in/sec
Display unitm / in
Battery life5,000 operations minimum
Parameter Results  
Code 112/3115-01Ra, Rz, Rv, Rp, Rt
Ra 40m (1600in)0.01m (0.4in)
Rz, Rv, Rp, Rt199m (7800in)0.1m (4in)
Overall dimensions4.92x3.15x1.5in
Component Dimensions an Conditions  
Min bore65mm (2.6in)
Min diameter25mm (1.0in)
Max temperature35C (95F)
Nominal Operating Conditions  
Temperature20C (68F)
Humidity0 to 80% non condensing
Storage Conditions  
Temperature0 to 50C  (32F to 122F)
Humidity0 to 80% non condensing

 SR 100 PDF

Home   Surface Articles    Contact Us  888-789-7277  Line Card 

 Rapp Industrial Sales * 127 Main Street * Connoquenessing, Pa 16027

Phone 888-789-7277 * 724-789-7853 * Fax 724-789-7288 Email: sales



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