Absolute Arm - 7 Axis SE

hpl208scannerThe Romer Absolute Arm 7-Axis "SE" series is the ultimate modular scanning solution. Its redesigned ergonomic handle is easily converted from an external scanner to an integrated version.  Sensory feedback makes it ideal for harsh shop floor conditions while its low-weight, high accuracy features are perfect for reverse engineering applications.

The Absolute Arm seven axis "SE" series allows the connection of the highly accurate HP-L-20.8, an interchangeable high performance external laser scanner. Removing the scanner allows the system to function as a 7 axis "pistol grip" tactile inspection system. The ROMER feature pack capability of the SE series arm means that an external laser scanner can easily be added, changed, or upgraded at any time, for greater convenience plus future proofing. 

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  1. Patented Infinite Rotation in the principle axes allows access to difficult to reach areas, while avoiding damaging the arm against rotational hard stops.
  2. Kinematic Probe Joint, the same type used in Hexagon Metrology bridge CMMs, provides repeatable connection of probes, with no need for recalibration. Automatic and repeatable probe recognition allows you to store hundreds of calibrated probe profiles for instant recall.
  3. Redesigned, ergonomic Pistol Grip handle increases operator comfort and productivity.  It is easy to hold, and is used to inspect parts or to interact with the software when in "mouse mode". Haptic feedback vibrates the wrist to alert the operator in noisy shop floor environments.
  4. Patented SpinGrips are infinitely rotating, low-friction "approved" hand hold positions for better user ergonomics. SpinGrips allow the arm to "float" in the operator's hands, reducing stress on the arm thus maximizing accuracy and repeatability while minimizing user fatigue.
  5. Absolute Encoders, super high-accuracy rotary encoders, designed specifically for Romer Absolute Arms, improve overall system accuracy while eliminating all complicated "homing" procedures.
  6. Aerospace grade Carbon Fiber Tubes provide a lightweight, stiff structure that is thermally stable. Under normal usage the carbon fiber tubes have a lifetime warranty.
  7. Low Profile Zero-G Counterbalance balances the arm's weight for easy, operation with effortless control, even above and below the arm's centerline. Better ergonomics means lower operator fatigue and better measuring results.
  8. Integrated handle and lifting point under counterbalance allow for easy carrying.
  9. Feature Packs plug into the base and provide interchangeable and upgradeable add-on capabilities such as WiFi connection, battery power, interface for laser scanners and more.
  10. Universal quick mounting base attaches to a variety of available base and stand options including magnetic bases.
  11. Fully integrated scanning solution – no additional cables or controller box
    • Automatic laser power control – allows to scan on different surface types with no operator interaction
    • No warm-up time
    • Factory calibrated and certified scanning systems according to B89.4.22 (for Hexagon scanners only)
    • No coating or surface preparation necessary
    • Scanning and probing interchangeable, automated probe recognition
  12. Calibrated Length Standard – ROMER provides a NIST traceable calibrated length standard with each arm to allow the operator to easily verify and document system performance for ISO or vendor requirements.


The ROMER Absolute Arm Scanner 73 and 75 series offer two different levels of performance and features to suit most inspection requirements.

73-Series 75-Series
Absolute Encoders Included Included
Zero-G Counterbalance with Lock Included Included
SpinGrips N/A Included
TESA TKJ Connector Included Included
3 TESA Hard Probes Included Included
Integrated Scanner Included Included
Feature Pack ROMER Scanning Pack ROMER Scanning Pack
Digital Camera N/A N/A
LED Worklight N/A N/A
Certified Calibration Sphere Included Included
NIST Traceable Length Standard Bar Optional Included
Hard Case Included Included
Dust Cover Included Included
Base Bolt-down base plate Magnetic
Travel Case Included Included
Application Software

For Inspection:
For Reverse Engineering:

PC-DMIS Scanning
PC-DMIS Reshaper

PC-DMIS Scanning
PC-DMIS Reshaper
Utility Software RDS RDS
Factory Calibration and Certification according to B89.4.22* Included Included

*Hexagon Scanners only

Technical Specifications

7-Axis ROMER Absolute Arm for External Scanners Probing – 73 series

Model3 Measuring Range Probing
Point Repeatability1
Volumetric Accuracy2
Arm Weights


2.0 m / 6.6 ft.  0.044 mm / 0.0017 in. ± 0.061 mm / 0.0024 in. 7.9 kg / 17.4 lbs.


2.5 m / 8.2 ft.  0.049 mm / 0.0019 in. ± 0.069 mm / 0.0027 in. 8.2 kg / 18.1 lbs.


3.0 m / 9.8 ft.  0.079 mm / 0.0031 in. ± 0.100 mm / 0.0039 in. 8.5 kg / 18.7 lbs.


3.5 m / 11.5 ft.  0.099 mm / 0.0039 in. ± 0.125 mm / 0.0049 in. 8.8 kg / 19.4 lbs.


4.0 m / 13.1 ft.  0.115 mm / 0.0045 in. ± 0.151 mm / 0.0059 in. 9.1 kg / 20.1 lbs.


4.5 m / 14.8 ft.  0.141 mm / 0.0056 in. ± 0.179 mm / 0.0070 in. 9.4 kg / 20.7 lbs.

7-Axis ROMER Absolute Arm for External Scanners Probing – 75 series

Model3 Measuring Range Probing
Point Repeatability1
Volumetric Accuracy2
Arm Weights


2.0 m / 6.6 ft.  0.023 mm / 0.0009 in. ± 0.033 mm / 0.0013 in. 8.2 kg / 18.1 lbs.


2.5 m / 8.2 ft.  0.027 mm / 0.0011 in. ± 0.038 mm / 0.0015 in. 8.5 kg / 18.7 lbs.


3.0 m / 9.8 ft.  0.042 mm / 0.0017 in. ± 0.058 mm / 0.0023 in. 8.8 kg / 19.4 lbs.


3.5 m / 11.5 ft.

 0.055 mm / 0.0022 in.

± 0.081 mm / 0.0032 in.

9.1 kg / 20.1 lbs.


4.0 m / 13.1 ft.  0.067 mm / 0.0026 in. ± 0.098 mm / 0.0039 in. 9.4 kg / 20.7 lbs.


4.5 m / 14.8 ft.  0.084 mm / 0.0033 in. ± 0.119 mm / 0.0047 in. 9.7 kg / 21.4 lbs.

All specifications according to B89.4.22.

1 The Point Repeatability Test is the reference test to determine measurement arm repeatability with ball probe. The cone is in front of the machine. Points are measured from multiple approach directions. The average point and the deviation of each point to the average center are calculated. The result is the maximum range divided by two.

The Probe Volumetric Accuracy test most accurately represents the reasonable expectations for machine performance in practical measuring applications since it involves measuring a certified length standard many times in several locations and orientations and compares the resultant measurements to the actual length. The Volumetric Length Accuracy Test is the most appropriate test for determining machine accuracy and repeatability. The result is the maximum deviation of the measuring distance less the theoretical length.

3 Se designates the ROMER Absolute Arm for external scanner.


Ambient conditions:

  • Working temperature: 0°C - 50°C (32°F – 122°F)
  • Storage temperature: -30° -70° C (-22°F – 158°F)
  • Relative humidity: 10% - 90% non-condensing
  • Operational elevation: 0-2000 m (0-6600 ft)

Marks of conformity:

  • CE Compliance: Yes

Power requirement:

  • Universal worldwide voltage 110V-240V

All probing specifications are achieved with a ROMER Absolute Arm mounted on a ROMER base plate or magnetic base and using a 15 mm steel ball probe with a length of 50 mm under stable environmental conditions.

HP-L-20.8 Scanner


Technical Characteristics
Laser Class 2
Standoff 180 ± 40mm
Line Rate Max. 100 Hz
Scan Width (Mid) 220 mm/ 130 mm/ 63 mm/51 mm/25 mm
Data Rate Max. 150,000 points per second
Minimum Point Spacing Min. 0.013 mm
Probing Form Error ( 1σ) 9 μm
Probing Dispersion Value* 36 µm
Operating Temperature 10° to 42° C/50° to 108° F
Warmup Time 5 minutes
Sensor IP Rating 64
Sensor Size L x W x H 137 x 76 x 85 mm
Sensor Weight 410g (462g with silicon sleeve)
Relative Humidity 10% to 90% non-condensing
Operational Elevation 0 to 2000 m 



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