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Equotip 550 Leeb


Equotip 550 Leeb – Portable Metal Hardness Tester

Equotip 550 is a versatile hardness tester for on-site testing of
heavy, large or installed parts. It is compatible with upcoming
developments, such as other measuring principles and new types of probes
etc. The new-generation display unit with touchscreen leverages the
high measuring accuracy with an unmatched user experience leading to
increased measurement efficiency. It also comes loaded with interactive
wizards, handpicked for specific industry applications in order to
increase reliability and to assure precise measurements, including oil
& gas, automotive, aerospace and steelworking applications.

Leeb rebound hardness testing is mainly
used for on-site testing of heavy, large or already installed metal
parts, but is also applied for testing composites, rubber and rock.  An
Equotip 550 is a future-proof investment as it can be extended with
additional test methods and features currently in development. Because
of this, the Equotip 550 is the hardness testing instrument that offers
you the maximum flexibility of portable hardness testing applications.


Leeb hardness principle is based on the
dynamic (rebound) method. An impact body with a hard metal test tip is
propelled by spring force against the surface of the test piece. Surface
deformation takes place when the impact body hits the test surface,
which results in loss of kinetic energy. This energy loss is detected by
a comparison of velocities vi and vr when the impact body is at a
precise distance from the surface for both the impact and rebound phase
of the test, respectively. Velocities are measured using a permanent
magnet in the impact body that generates an induction voltage in the
coil which is precisely positioned in the impact device. The detected
voltage is proportional to the velocity of the impact body. Signal
processing is then providing the hardness reading.


  • Fire damage assessment
  • Engine cylinder
  • Narrow automotive parts
  • Aluminium castings
  • Steel rolls
  • Marine industry
  • Energy sector
  • Transmission gears
  • Rolling mills
  • How to create specific conversion curves
  • Leeb and Portable Rockwell combined
  • Automotive system integration
  • Thermal cutting
  • Stator wedge
  • NDT of rock reference list


  • Use full Leeb probe portfolio and combine with Portable Rockwell and UCI
  • Comes with the high accuracy known for all Equotip products
  • Ready-to-go reports through powerful built-in reporting feature



  • Automatic compensation for impact direction
  • Personalized user profiles and views
  • Integration in automated testing environments (incl. remote control)
  • 11 Languages and timezone supported


  • Equotip Link PC Software allowing direct reporting and custom reports

Display & Memory:

  • 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

Impact Device Selection

Support Rings

Leeb Support RingsLeeb
hardness testers provide accurate measurements if the impact body has a
certain position in the guiding tube at the moment of its impact onto
the test surface. When testing flat samples with standard support rings,
the spherical test tip is located precisely at the end of the guiding
tube. However, when testing curved samples with the standard support
rings, this may not always be the case. To ensure accurate measurements
in all cases, Proceq offers a range of special support rings designed
for measurements on curved sample surfaces.


The Equotip Leeb series of hardness
testers are standardized in ASTM according to A956-06 “Standard Test
Method for Leeb Hardness Testing of Steel Products”. This is the only
ASTM standard that currently addresses testing with the Leeb method. The
Leeb method measures the ratio of rebound velocity of a defined impact
body launched against a surface at a defined velocity. Therefore the
Leeb method measures the loss of kinetic energy during impact, and this
is considered a dynamic technique. The accuracy of a Leeb test is
dependent on proper test conditions – surface roughness, test piece
thickness, and mass – which are defined in the A956 standard. The A956
standard is not known to be specifically referenced by any current API

Touchscreen Unit

  • Touchscreen unitSimplified and improved usability on high resolution display
  • Personalized screens – arrange the view according to your needs
  • Elaborated user interface designed by industry experts for smooth operation
  • Ergonomically designed and shock-absorbing rubberised housing that provides protection against dust and water splashes
  • Connectors and circuits protected against dust and voltage spikes
  • Durable and scratch-resistant touchscreen
  • Operates in temperatures from -10°C to +50°C and in humidity up to 95%


Key features

    Automatic conversions to all common hardness scales (HV, HB, HRC, HRB, HRA, HS, Rm) as required
    Highly accurate ± 4 HL (0.5% at 800 HL) with automatic correction for impact directions
    Wide measurement range with a variety of impact devices and support rings to serve most hardness testing requirements
    Extensive range of precise hardness test blocks available for each impact device with different hardness levels for regular verification

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