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Hardness Testing

Equotip 550 Leeb

Highly robust and advanced Leeb measuring system

  • Swiss quality, accuracy, and reliability combined with powerful software features
  • World's broadest selection of probes and conversion tables
  • A fully rugged casing and long-lasting probes


Hardness testing of casts, flanges, shafts, and bars/pipes / Near-line Quality Control / Heat-treated surfaces

The highest accuracy, durability, and functionality from the inventor of the Leeb method
The unmatched lifespan of probes and impact bodies, lasting four times longer than others on the market.
Comes with the most complete probe portfolio, the broadest material conversion tables including Proceq's own research and world's widest standard conversion.
User Experience
Ready-to-go reports through powerful built-in reporting feature, along with fully customizable views, multiple wizards, and material selection assistant.

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Software for Equotip 550 Platform
Equotip 550 Platform
Tech Specs
Equotip 550 Platform
7” color capacitive touchscreen

Instrument protection
- IP54, fully rugged with shock absorbing casing,
- Scratch-resistant Gorilla® Glass screen protection,
- Circuit and connector protection against dust, debris, chemicals and voltage spikes
- Foldable additional screen cover for additional protection during storage and transportation

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

Combination with another testing method
UCI, Portable Rockwell (PRT)

Ethernet & USB-B (PC connection), USB-A (PRT), Probe-specific slots

3.6V, Li-Ion, 14’000 mAh

Battery lifetime
> 10h (in standard operating mode)

Charging time
< 9h, < 5.5 h (External quick charger)

Power input
12V +/- 25% / 1.5A

250 x 162 x 62 mm / 9.87 x 6.37 x 6.44 in

1’525 g / 3.35 lbs. (incl. battery)

Humidity operation
<95% RH, non-condensing

Operating temperature
(-) 10°C + 50°C / 14°F – 122°F


Equotip 550 Software Features
- Automatic compensation for impact direction (except DL probe)
- Fully customizable reporting
- Customizable views
- Verification wizard
- Measurement wizard
- Mapping wizard
- Integration in automated testing environments (incl. remote control)
- Custom conversion curves (1-point, 2-point, polynomial)
- Built-in pdf creator

Conversion curves applicable for materials
- Steel and cast steel
- Work tool steel
- Stainless steel
- High alloy steel (Leeb D only: P/T91-92, 20Cr13, GH4145, C422, 630 grade, 616 grade)
- Grey Cast Iron (Lamellar, Nodular)
- Cast aluminium
- Brass Cu/Zn Alloys
- Wrought copper alloys

English, German, French, Italian, Spanish, Portuguese, Turkish, Chinese, Korean, Russian, Japanese, Polish, Czech

Regional settings
Metric and imperial units, multi-language and time-zone

Audio support
Full digital audio

Desktop Software (Windows)
PC Software
Equotip Link for data download, management and export (CSV, PNG), Conversion curve management, and for upgrades of constantly expanding Equotip and Equotip Link Software

Language support
English, Chinese, Czech,German, Spanish, French, Italian, Korean, Japanese, Polish, Portugese, Russian, Turkish
Equotip 550 Leeb Tech Specs
Tech Specs
Native Scale
HLx (x=C, D, DC, DL, E, G, S)

Conversion scales
HB, HV, HRA, HRB, HRC, HS, MPA (σ1, σ2, σ3)

Measurement range
100-999 HLx

Tungsten carbide (D, DC, DL, G, C), Polycristalline diamond (E), Silicon Nitride (S)

Impact energy / Test force
90 Nmm (G)
11 Nmm (D, DC, DL, S, E)
3 Nmm (C)

Accredited calibration
ISO/IEC 17025

Standard compliance
DIN EN ISO 16859
GB/T 17394
JB/T 9378

DGZfP Gudeline MC 1
VDI / VDE Gudeline 2616 Paper 1
Nordtest Technical Reports 99.12, 99.13, 99.36

Conversion standards
ISO 18265
DL/T 1845 (Leeb D only)
Proceq's own conversion curves

Measurement resolution
1 HLx/HV/HB; 0.1 HRC/HRB/HS 1 N/mm 2 (Rm)

Measuring accuracy
± 4 HLx (0.5% @850 HLx)

Measurement deviation (E)
Lower than DIN EN ISO 16859

Coefficient of variation (R)
Lower than DIN EN ISO 16859

57 g / 2 oz

41 mm x 20 mm x 147 / 1.61 in x 0.79 in x 5.79
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Standards & Guidelines


  • Arrow, click names to download Standards & Guidelines ASTM A 370
  • Arrow, click names to download Standards & Guidelines ASTM A 956
  • Arrow, click names to download Standards & Guidelines ASTM E 140
  • Arrow, click names to download Standards & Guidelines DIN 50156
  • Arrow, click names to download Standards & Guidelines DL/T 1845 ( China )
  • Arrow, click names to download Standards & Guidelines GB/T 17394
  • Arrow, click names to download Standards & Guidelines ISO 16859
  • Arrow, click names to download Standards & Guidelines ISO 18265
  • Arrow, click names to download Standards & Guidelines JB/T 9378


  • 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

What parameters are important when choosing the right Leeb probe?

Minimal mass of the tested piece
Minimum requirements for the surface roughness (and corresponding time)
Sample accessibility
Materials microstructure (coarser grains are preferably measured by the probes with higher...

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What Leeb probe has the lowest impact energy?

It is Probe type C with 3 Nmm (vs. 11 nMm for probe D), its suitable for surface-treated materials or small objects, however it must fulfill the requirements specified by the standards and by Proceq.

Is Equotip Leeb easy to use?

Yes, very easy and has very high repeatability. The exception is a DL probe, which has presumably higher inertia due to the elongated impact body and unstable base of the probe. Due to this, the probe is known to be...

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Can small objects be investigated with Leeb?

Yes, but only if they follow the requirements specified by Proceq. Samples can be measured as coupled and uncoupled.

The wall thickness and mass of the test object can influence hardness testing according to Leeb or UCI....

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