Professional roughness measuring device with various probes for different applications to measure up to 11 roughness parameters

SRTPro Plus

The Split-TYPE roughness tester SRT Pro Plus is a high-precision instrument for measuring surface roughness. It is suitable for determining the roughness of a variety of machined parts, including flat, inclined, and external cylindrical surfaces, as well as curved surfaces, small holes, and grooves.

The various probes are suitable for both metal and non-metal parts, especially for machined parts in the manufacturing industry. It is frequently used for measuring the roughness of small workpieces and for on-site inspection of large workpieces. This device is ideal for testing, quality control, and final inspections in various departments.

Properties

Measurement type: The measurement unit can either be integrated directly into the main device or operated separately with a connecting cable.
Measurement range:
- Y-axis: 320 μm (−160 μm to +160 μm)
- X-axis: 17.5 mm
Data storage: Capacity for 100 measurements.
Display: Large, easy-to-read 3.5-inch TFT display (480 × 320 pixels) with wide viewing angle. Displays numerous pieces of information such as battery status, device status, stylus position, measurement settings, and more.
Interfaces: Bluetooth connectivity to printers or Android devices. PC software for transferring measurement data to a PC or laptop via the supplied cable.
Real-time waveform: Synchronized display of the measurement curve during acquisition.
Standard sensor: axis type sensor – suitable for approximately 90% of all applications.
Processor: DSP chip with high processing speed and low power consumption.
Optional accessories: Curved sensor, sensor for very small holes, measuring stand, extension rod, printer, etc.

Measurement principle

During the measurement process, the sensor is moved linearly along the probing path. The probe follows the profile of the probing path and moves up and down. These movements are converted into electrical signals, which are then amplified, filtered, and converted into digital values using an A/D converter. Based on these values, a mathematical representation of the profile is created using a microprocessor. Based on this representation, the Ra and Rz values (or Rq and Rt values) are then calculated according to the relevant standards and displayed on the screen.

Standard delivery scope

Device SRTPro Plus
Standard axis probe
Roughness standard Ra
4-foot height adapter
1 m extension cable for external operation
Touch pen
Charger
Data cable and software
Operating manual
Carrying case

Special accessories

Additional test stylus for special applications
Portable Bluetooth Printer
Measuring Stand

Downloads

Datasheet SRTPro Plus (PDF)

pdf - 961 KB

User Manual SRTPro Plus (PDF)

pdf - 6 MB

DataView Rel. 1.1 (ZIP)

Software

zip - 11 MB

Specifications

Roughness Parameters	Ra, Rz, Rq, Rt, Rc, Rp, Rv, R3z, R3y, Rz(JIS), Ry, Rs, Rsk, Rku, Rmax, Rsm, Rmr, Rpc, Rk, Rpk, Rvk, Mr1, Mr2 µm/µinch switchable
Measuring Range	Ra, Rq: 0.005 - 32 µm Rz, R3z, Ry, Rt, Rp, Rv: 0.02 - 320 µm Rs, Rsm: 0.02 - 1,000 µm Rsk, Rmr: 0 - 100 %
Resolution (depending on range)	0.002 µm (range ±20 µm) 0.004 µm (range ±40 µm) 0.008 µm (range ±80 µm) 0.02 µm (range ±160 µm)
Measuring Range Y-axis (vertical)	320 µm (−160 µm to +160 µm)
Measuring Range X-axis (horizontal)	17.5 mm
Standard	ISO4287, ANSI b46.1, DIN4768, JISb601
Graphic	Primary profile, Roughness profile, load curves
Filter	RC, PC-RC, Gauss, D-P
Cut-off Wavelength	0.25 mm / 0.8 mm / 2.5 mm
Traversing Length Ln	Ln = lr × n, n = 1 - 5
Principle	Differential Inductance
Stylus tip	Natural Diamond, cone angle 90°, tip radius 5 µm
Force / Skid force	Measuring force: 4 mN, Skid force: less than 400 mN
Skid	hard alloy, skid radius 40 mm
Measuring speed	lr=0.25: Vt=0.135 mm/s lr=0.8: Vt=0.5 mm/s lr=2.5: Vt=1 mm/s Return: Vt=1 mm/s
Tolerance	±(5nm + 0.1A); A: Ra of calibration test block
Repeatability	no more than 3%
Residual profile	no more than 0.010 µm
Power Supply	Built-in 3.7V/3000mAh Lithium-ion battery; Charger: DC5V, 800mA / 3 hours
Dimensions Display unit (L x W x H)	158 x 55 x 52 mm
Dimensions Drive unit (L x W x H)	115 x 23 x 27 mm
Weight	About 500 g (Display unit + Drive unit + Sensor)
Working Environment	Temperature: -20°C to +40°C, Humidity: < 90% RH
Storage and Transportation	Temperature: -40°C to +60°C, Humidity: < 90% RH

All SaluTron^® measuring devices comply with national (DIN) and international (ISO, BS, ASTM) standards and carry the CE mark.
Subject to technical changes.

	KS100 – Sensor for small holes, suitable for flat and inclined surfaces as well as conical workpieces; measures in holes with a diameter greater than 5 mm and a depth less than 15 mm.
	KS110 - Sensor for curved surfaces, suitable for convex or concave surfaces with a radius of curvature of 3 mm or more.
	KS120 – Sensor for very small holes, suitable for holes with a diameter > 2 mm and a depth < 9 mm.
	KS130 – Groove sensor, measures in grooves with a width greater than 3 mm and a depth less than 3.2 mm; the distance from the stylus tip to the front edge is 3 mm.
	KS131 – Deep groove sensor, usable in grooves with a width of more than 3 mm and a depth of less than 10 mm; measures steps with a height of less than 10 mm.
	KS131P – 7 mm groove & curved sensor, suitable for grooves with a width greater than 1.5 mm and a depth less than 7 mm and for measuring steps under 10 mm in height.
	KS132 – 13 mm groove & curved sensor, suitable for grooves with a width > 2 mm and a depth < 13 mm and measures steps of less than 15 mm.
	KS133 – 13 mm narrow groove sensor for grooves with a width greater than 1.2 mm and a depth less than 13 mm; also measures steps of less than 15 mm.
	KS135 – 23 mm groove sensor for grooves with a width > 2 mm and a depth < 23 mm; measures steps smaller than 25 mm.
	KS160 – Axe-type sensor (axial sensor), for measurements in grooves with a width of more than 3 mm and a depth of less than 3.2 mm. The distance from the stylus tip to the front edge is 1.6 mm. Measurement on flat surfaces when used in a split-type roughness tester.
	KS55 – Extension rod, extends the sensor length by 50 mm. Maximum 3 pieces.
	KS90 – Angle rod, it changes the direction of the sensor so that it moves transversely, mainly for the surface of certain grooves, e.g., on crankshafts.
	KA520 - Metal substrate work platform, liftable, convenient and stable for the testing process. • Height adjustable: 200±1 mm • Return error: ≤ 1/6 turn of the lifting wheel • Base dimensions: 330 mm × 295 mm × 12 mm • Rotation angle: 80° • Packaging size & weight: 42 × 21 × 15 cm, 5 kg
	Work platform with marble base, incl. V-block • Height adjustable: 300±1 mm • Return error: ≤ 1/6 turn of the lifting wheel • Marble size: 400 mm × 250 mm × 70 mm • Rotation angle: 80° • Packaging size & weight: Column: 54 × 24 × 15 cm, 4.5 kg; Marble plate: 43.5 × 28.5 × 10 cm, 23 kg
	Height gauge for adjusting the height and alignment of a tester. Especially suitable for split-type surface roughness testers. Adjustable maximum height: 300 mm.
	Magnetic stand, arm length: approx. 200 mm including joint. • The column: approx. 200 mm high including base. • Adjustable maximum height: 150 mm. • Rod of the magnet adapter (the part that attaches to the tester): Ø 8 mm.
	Standard roughness calibration block – multi-reticle probe (rectangular shaft) Made of optical glass; high hardness, highly accurate standardized roughness value, scratch-resistant and significantly more durable than metal roughness blocks. Complies with standards GB/T19067.1-2003 and ISO5436-1:2000 Approximate values: Ra = 0.1 μm, 0.2 μm, 0.4 μm, 0.8 μm, 1.6 μm, 3.2 μm, 6.4 μm Custom values and sine waves available on request.
	Roughness calibration block - single engraved lines Complies with GB/T 19067.1-2003 and ISO 5436-1:2000 Approximate value: H 10–20 µm (roughness tester uses filters D–P; the RT value is measured) Custom values available.
	Mini thermal printer Dimensions: 108 × 76 × 46.6 mm External printer, interfaces: USB, Bluetooth. The baud rate will be set before delivery to match connection to the measuring device. Suitable for our roughness, hardness, and thickness gauges. Paper size: width (57.5 ± 0.5) mm, diameter 30 mm.

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Areas of application of roughness testers

Automotive industry
Aerospace industry
Mechanical engineering
Medical technology
Electronics industry