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Hardness Testing

Equotip 550 UCI

The leading Ultrasonic Contact Impedance measurement system with advanced capabilities
  • Unmatched versatility owed to HV1, HV5, and HV10 test loads in a single probe
  • Patented adjustable test load for higher accuracy on a wide range of applications
  • Powerful measurement device on the market packed in a rugged chassis


Ultrasonic Inspection of Welds / Ultrasonic Inspection of Cast and Forged Metals / Heat-treated surfaces

Adjustable test load and a rugged touchscreen with enhanced software and analysis features
Efficiency to the power of 2 thanks to three loads in one single probe HV1, HV5, and HV10 and possible combination with Portable Rockwell and Leeb in one device.
Features with wizards, user guidance, personalised views, and on-screen feedback to reduce measurement inaccuracies that can be caused by the operator.
User Experience
User guidance, smart material, and probe selection wizards, and ready-to-go reports through a powerful built-in reporting feature facilitate even short measurement campaign.
Equotip 550 UCI Tech Specs
Tech Specs
Native Scale

Available Scales

Available Probes
UCI, adjustable load (HV1, HV5, and HV10)

Combination With Other Methods
Leeb, Portable Rockwell

Average Roughness Ra (µm / µinch)
12.5 / 500

Minimum Mass (kg / lbs)
0.3 / 0.66

Minimum Thickness (mm / inch)
5 / 0.2

Instrument Firmware
Automatic compensation for impact direction
Personalized user profiles and views
Integration in automated testing environments (incl. remote control)
11 Languages and timezones
Measurement wizards
Custom curve wizard
Combined method wizard
User guidance features
Custom report features
One-step calibration
metric and imperial units support
Profile view
Heat Affected Zone (HAZ) line mapping

Pc Software
Equotip Link allowing direct reporting and custom reports

7” color rugged touchscreen unit (800 x 480 pixels) with dual core processor

Internal 8 GB flash memory (> 1’000’000 measurements)

USB host / device and Ethernet

Measuring Range
20 - 2000 HV

Verification according to
ASTM A1038, DIN 50159, GB/T 34205-2017, custom method, combined method

IP54, fully rugged with shock-absorbing casing

Custom conversion curves
Yes, 1-point shift, 2-point, polynomial

Coefficient of variation
Significantly lower than the limits set in DIN 50159, ASTM A1038 & GB-T 34205-2017

Innovation Award
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What influence does the chemical composition of a certain steel group has on the UCI measurement?
For example, will the result be different on 100Cr6, 100CrMnSi6-4 or 100CrMnMoSi8-4-6 ? All the mentioned steel compositions have similar values of Elastic modulus (E), therefore the results will not be strongly affected by the UCI measurement. However, the ideal values are measured with 100CR6.

What is UCI particularly good for?
Inspection of HAZ (Heat Affected Zones) especially used in oil and gas in industry, inspection of lighter objects where Leeb can not be used due to weight limitation, inspection of areas that can not be reached by anything else than think nose of UCI.

What parameters are important when choosing the right UCI Probe?
There are several important parameters that shall be taken into account when selecting the UCI probe: Minimum thickness of the object If a coating is tested, then also the minimum thickness of the “coating“ which should correspond at least 10x the indentation depth by an indenter, Elastic modulus of the material is important to be known, as conventional UCI devices are calibrated to low alloy steel with E around 210 GPa Appropriate surface roughness, specific for the selected probe

What is the most used Load?
The HV5 (5kgf, 49.05 N) load is the most commonly used, especially within the Oil and Gas industry.

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Standards & Guidelines


  • Arrow, click names to download Standards & Guidelines ASTM A 1038
  • Arrow, click names to download Standards & Guidelines ASTM E 140
  • Arrow, click names to download Standards & Guidelines DIN 50159
  • Arrow, click names to download Standards & Guidelines GB/T 34205-2017
  • Arrow, click names to download Standards & Guidelines ISO 18265


  • Arrow ASME CRTD-91
  • Arrow DGZfP Guideline MC 1
  • Arrow Nordtest Technical Reports 424-1, 424-2, 424-3
  • Arrow VDI / VDE Guideline 2616 Paper 1