ROMER Absolute Arm

ROMER Absolute Arm

A first in the world of portable measuring arms: The ROMER Absolute Arm features absolute encoders and is therefore the first measuring arm which does not require referencing before measurement. When the arm is turned on, it’s ready to go.

Quality control, inspection, on-machine verification, reverse engineering, virtual assembly or 3D modelling. Wherever these needs arise, you will find the ROMER Absolute Arm. Much more than just a metrology tool, its value lies in its versatility. Portability, stability, light weight and high-performance laser scanners make the ROMER Absolute Arm an all-purpose 3D measurement, analysis and digitising tool that can be used by anyone, anywhere and with minimum training.

Unlike many metrology devices, the ROMER Absolute Arm does not require warm-up time or initialization, thanks to a stable carbon fiber structure and industry leading Absolute encoders. Simply take the measuring arm to the part, switch it on and start measuring.

All models of the ROMER Absolute Arm are available in three levels of accuracy, allowing you to select the right measuring arm for your application requirements and budget. The 73 Series and 75 Series arms offer excellent price/performance ratios for everyday metrology operations, while the 77 Series – the most accurate ROMER Absolute Arm ever produced – is ideal for specialist or high-end measurement applications.

The ROMER proprietary software RDS features SMART technology, allowing total management of checks in the field as well as temperature and shock monitoring.

Laser Scanning
The ROMER Absolute Arm is available with a completely integrated high-performance laser scanner or the external HP-L-20.8 scanner, for complex scanning tasks.
ROMER Absolute Arms are the only scanning systems on the market to offer  fully verifiable scanning system accuracy.

Automated & repeatable Probe Recognition
Intelligent Quick Change Probes: Swap touch-probes at any time without the need to recalibrate. The Romer Absolute Arm’s repeatable mount allows to change probes on the fly, according to your measurement needs.

Instant Feedback
The ROMER Absolute Arm provides immediate acoustic and haptic feedback to the operator, allowing the Romer Absolute Arm to be used in even the most harsh industrial environments.

Absolute Encoders
Referencing and warm-up time was for yesterday – just switch the arm on and measure.

Measurement Volume
Size does matter: The ROMER Absolute Arm is available in seven lengths between 1.2 m and 4.5 m.

All ROMER Absolute Arms including scanning systems pass through B89.4.22 certification. Additional certifications according to VDI/VDE 2617-9 are also available. The ROMER Absolute Arm Compact model is available with a choice of ISO 10360-2 or B89.4.22 certification.

Zero G
Zero G counterbalance eliminates torque in the base and arm members, more forgiving of the arm being mounted in a vertical position and puts you in control of the arm.

If the Romer Absolute Arm is not in use it can be locked safely into its rest position. SmartLock also allows the arm to be fixed in any intermediate position.

Feature Packs
Thanks to easily interchangeable Feature Packs, the functionality of the Romer Absolute Arm can always be enhanced. Feature packs are available for wi-fi communication, wi-fi scanning capability and full battery operation.


73 seriesModelMeasuring RangePoint Repeatability 1Volumetric Accuracy 2Arm Weights
73121.2 m / 3.9 ft. 0.014 mm / 0.0006 in.± 0.025 mm / 0.0010 in.10.2 kg / 22.5 lbs
73202.0 m / 6.6 ft.0.030 mm / 0.0012 in.± 0.042 mm / 0.0017 in.7.4 kg / 16.3 lbs
73252.5 m / 8.2 ft.0.038 mm / 0.0015 in.± 0.051 mm / 0.0020 in.7.7 kg / 17.0 lbs
73303.0 m / 9.8 ft.0.059 mm / 0.0023 in.± 0.075 mm / 0.0030 in.8.0 kg / 17.6 lbs
73353.5 m / 11.5 ft.0.079 mm / 0.0031 in.± 0.100 mm / 0.0039 in.8.3 kg / 18.3 lbs
73404.0 m / 13.1 ft.0.099 mm / 0.0039 in.± 0.125 mm / 0.0049 in.8.6 kg / 19.0 lbs
73454.5 m / 14.8 ft.0.120 mm / 0.0047 in.± 0.150 mm / 0.0059 in.8.9 kg / 19.6 lbs


75 seriesModelMeasuring RangePoint Repeatability1Volumetric Accuracy2Arm Weights
 75121.2 m / 3.9 ft 0.010 mm / 0.0004 in. ± 0.020 mm / 0.0008 in 10.8 kg / 23.8 lbs
75202.0 m / 6.6 ft.0.016 mm / 0.0006 in.± 0.023 mm / 0.0009 in.7.7 kg / 17.0 lbs
75252.5 m / 8.2 ft.0.020 mm / 0.0008 in.± 0.029 mm / 0.0011 in.8.0 kg / 17.6 lbs
75303.0 m / 9.8 ft.0.030 mm / 0.0012 in.± 0.044 mm / 0.0017 in.8.3 kg / 18.3 lbs
75353.5 m / 11.5 ft.0.040 mm / 0.0016 in.± 0.057 mm / 0.0022 in.8.6 kg / 19.0 lbs
75404.0 m / 13.1 ft.0.055 mm / 0.0022 in.± 0.069 mm / 0.0027 in.8.9 kg / 19.6 lbs
75454.5 m / 14.8 ft.0.070 mm / 0.0028 in.± 0.082 mm / 0.0032 in.9.2 kg / 20.3 lbs


77 seriesModelMeasuring RangePoint Repeatability11Volumetric Accuracy2Arm Weights
77252.5 m / 8.2 ft.0.017 mm / 0.0007 in.+/- 0.026 mm / 0.0010 in.8.0 kg / 17.6 lbs
77303.0 m / 9.8 ft.0.026 mm / 0.0010 in.+/- 0.040 mm / 0.0016 in.8.3 kg / 18.3 lbs
77353.5 m / 11.5 ft.0.034 mm / 0.0013 in.+/- 0.051 mm / 0.0020 in.8.6 kg / 19.0 lbs
77404.0 m / 13.1 ft.0.047 mm / 0.0019 in.+/- 0.062 mm / 0.0024 in.8.0 kg / 17.6 lbs
77454.5 m / 13.5 ft.0.060 mm / 0.0024 in.+/- 0.074 mm / 0.0029 in.9.2 kg / 20.3 lbs

All Specifications according to B89.4.22 and VDI/VDE 2617-9

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.

2 The 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.

Ambient conditions
Working temperature: 0C – 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.

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