ROMER Absolute Arm with external scanner

Modular high-end scanning platform.

The ROMER Absolute Arm with external scanner is designed for the high performance laser scanner HP-L-20.8 from Hexagon Manufacturing Intelligence

The ROMER Absolute Arm with external scanner is the high-end laser scanning platform designed for the HP-L-20.8 laser scanner from Hexagon Manufacturing Intelligence. With HP-L-20.8, the ROMER Absolute Arm offers first-class performance on the most complex surface types. Automatic laser control means that multiple surface colours can be scanned in a single pass. Thanks to the HP-L-20.8’s unique flying dot technology, the scan width and point density are entirely variable, allowing the user to guarantee maximum scan detail where it’s needed most. 
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.

Increasing productivity across all industries.

HP-L-20.8 Laser Scanner for ROMER Absolute Arm

HP-L-20.8 – Fast and accurate scanning on the move.

About you
About your company
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 Series  Model  Measuring Range  Scanning system accuracy  Arms weights SE incl. Scanner
7320SE 2.0 m / 6.6 ft. 0.075 mm / 0.0030 in. 7.9 kg / 17.4 lbs
7325SE 2.5 m / 8.2 ft. 0.080 mm / 0.0031 in. 8.2 kg / 18.1 lbs
7330SE 3.0 m / 9.8 ft. 0.113 mm / 0.0044 in. 8.5 kg / 18.7 lbs
7335SE 3.5 m / 11.5 ft. 0.140 mm / 0.0055 in. 8.8 kg / 19.4 lbs
 7340SE 4.0 m / 13.1 ft. 0.172 mm / 0.0068 in. 9.1 kg / 20.1 lbs
7345SE 4.5 m / 14.8 ft. 0.203 mm / 0.0080 in. 9.4 kg / 20.7 lbs
75 Series 7520SE 2.0 m / 6.6 ft. 0.053 mm / 0.0021 in. 8.2 kg / 18.1 lbs
7525SE 2.5 m / 8.2 ft. 0.058 mm / 0.0023 in. 8.5 kg / 18.7 lbs
7530SE 3.0 m / 9.8 ft. 0.078 mm / 0.0031 in. 8.8 kg / 19.4 lbs
7535SE 3.5 m / 11.5 ft. 0.096 mm / 0.0038 in. 9.1 kg / 20.1 lbs
7540SE 4.0 m / 13.1 ft. 0.114 mm / 0.0045 in. 9.4 kg / 20.7 lbs
7545SE 4.5 m / 14.8 ft. 0.133 mm / 0.0052 in. 9.7 kg / 21.4 lbs
77 Series  7725SE 2.5 m / 8.2 ft. 0.046 mm / 0.0018 in. 8.5 kg / 18.7 lbs
 7730SE 3.0 m / 9.8 ft. 0.062 mm / 0.0024 in. 8.8 kg / 19.4 lbs
 7735SE 3.5 m / 11.5 ft. 0.077 mm / 0.0030 in. 9.1 kg / 20.1 lbs
 7740SE 4.0 m / 13.1 ft. 0.091 mm / 0.0036 in. 9.4 kg / 20.7 lbs
 7745SE 4.5 m / 14.8 ft 0.106 mm / 0.0042 in. 9.7 kg / 21.4 lbs

* The Scanning System Accuracy Test most accurately represents the reasonable expectations for machine performance in practical measuring applications while using the laser scanning method. The test consists of measuring a matte grey sphere with 5 different arm articulations. In each articulation of the arm the sphere is scanned from 5 different directions such that the majority of the sphere is scanned. The result is the maximum 3D centre to centre distance of the 5 spheres.

Scanning Sensor Specifications

 External scanner HP-L-20.8

 Max. point acquisition rate

 150,000 Points/s

 Points per line

 Max. 4000

 Line rate

 Max. 1000 Hz

 Line width range  Min  176mm / 104mm / 51mm /  40mm / 20mm
 Mid  220mm / 130mm / 63mm / 51mm / 25mm
 Max  231mm / 148mm / 75mm / 60mm / 30 mm

 Stand off (mid range)

 180 mm ± 40 mm

 Minimum point spacing (mid  range)

 0.013 mm

 Laser power control

 Fully automatic (per point)

 Probing Form error (1 σ)

 9 μm

Probing Dispersion value**


36 µm


 410 g



 Laser Safety

 Class 2

 Working temperature

 10°-42° C (50°-108° F)


ROMER Absolute Arm brochure
ROMER Absolute Arm 77 Series Brochure
ROMER VDI/VDE Specifications
ROMER product catalogue
ROMER Absolute Arm overview brochure
HP-L-20.8 Brochure
ROMER Tube Inspection factsheet
ROMER Absolute Arm SI flyer
Case Study - CLAAS Agro, Tashkent, Uzbekistan
Case Study - Johnson Controls, Slovenia
Application Report - PCT
Application Report - Strata Manufacturing PJSC
KYB - Ororbia, Spain
Case study Red Bull Technology - Milton Keynes


Hexagon’s annual international conference, HxGN LIVE, contains inspiring keynotes, unlimited networking and must-see technologies.