BYK Additives & Instruments

Hardness Testers

Hardness Testing Equipment

Coating hardness is the resistance of a coating to a mechanical force such as pressure, rubbing, or scratching. There are many hardness measurement devices available depending upon the end use application. Hardness testing equipment can range for an economical scratch tester to a stationary indentation hardness device. BYK-Gardner offers several portable hardness testers for in the field applications as well as laboratory bench models. Selecting the correct instrument depends on the coating’s end-use application and level of precision needed in your test results.

Pendulum Hardness Tester

Buchholz Indentation Tester


The Pendulum Hardness tester is very precise measurement of hardness using either a Konig or Persoz pendulum.
The Buchholz tester is a reliable test for plastic deformable coatings.
The DUR-O-Test uses a needle under an adjustable pressure spring to create a scratch on the coated surface.
  • Digital counter to display and record the test results
  • Acoustical signal to notify the operator the completion of the test
  • Selector switch to display either oscillations or seconds
  • Easy changeover of the pendulums
  • Protective cover to eliminate the influence of air currents
  • Compliant with ASTM D4366 and ISO 1522
  • Simple and easy to use device
  • Portable for in the field use
  • Optional microscope to evaluate the indentation mark
  • Compliant with ISO 2815
  • Can be used for flat or curved surfaces
  • Pocket size device
  • Locking screw to fix the spring tension
  • Three pressure springs available for a wide spring force range
  • Needle made of tungsten carbide for long life
  • International Standards
  • ASTM
    D 4366

  • Prices and Products
  • 5858
    Pendulum Hardness Tester König
    Pendulum Hardness Tester Persoz
    Pendulum Hardness Test König/Persoz
  • Comes complete with
  • Pendulum hardness tester
    Protective cover
    Cable release
    Glass plate
    Spirit level
    Main cable
  • Specifications (PDF)
  • Accessories
  • 5860
    Cable Release
    Persoz Pendulum
    König Pendulum
  • International Standards
  • ISO
  • Prices and Products
  • 5825
    Buchholz Tester
    Buchholz Tester w/microscope
  • Specifications (PDF)
  • Accessories
  • 5824
    Precision Microscope
  • Prices and Products
  • 5810
    DUR-O-Test, 1 mm
    DUR-O-Test, 0.75 mm
  • Comes complete with
  • DUR-O-Test
    3 pressure springs in a leather case
  • Specifications (PDF)
  • Accessories
  • 5813
    Hard Metal Needle 1 mm
    Hard Metal Needle 0.75 mm

    Wolff-Wilborn Pencil Hardness Tester

    Pencil Hardness Tester Set

    The Wolff-Wilborn Pencil Hardness test offers a higher level of precision for a pencil scratch tester.
    The Pencil Hardness tester consists of individual leads with a lead holder.
    • Precision made to maintain a constant pressure force
    • Built-in level to keep the tester parallel to the sample surface
    • Adjustable weight to compensate for any change to the pencil
    • Quick changeover of pencils to minimize down time
    • Fixes pencil angle to the sample surface
    • Compliant with ISO, ASTM, DIN, BS standards
    • Economical device for scratch hardness
    • Easy to use
    • Complete lead sets available
    • Compliant with ASTM D3363
  • International Standards
  • ASTM
    D 3363


    DIN EN


  • Prices and Products
  • 5800
    Wolff-Wilborn Pencil Hardness
  • Comes complete with
  • Pencil hardness tester PH-5800
    Complete set of 20 pencils from 9B to 9H
    Pencil sharpener
    Abrasive 400 grit paper
    Carrying case
  • Specifications (PDF)
  • Accessories
  • 5801
    Pencil set (20 pcs), PH-5800
  • International Standards
  • ASTM
    D 3363
  • Prices and Products
  • 9500
    Pencil Hardness Tester Set
  • Comes complete with
  • Pencil Holder Set PH-9500, 10 grades of leads:
    2B, B, HB, F, H, 2H, 3H, 4H, 5H, 6H, in packs of 12 each
  • Specifications (PDF)
  • Accessories
  • 9512
    Replacement Leads, Grade 6B, PH-9500
    Quantity: 12 per pack
    Replacement Leads, Grade 4H, PH-9500
    Quantity: 12 per pack
    Replacement Leads, Grade 5H, PH-9500
    Quantity: 12 per pack
    Replacement Leads, Grade 6H, PH-9500
    Quantity: 12 per pack
    Lead Holder, PH-9500
    Replacement Leads, Grade 5B, PH-9500
    Quantity: 12 per pack
    Replacement Leads, Grade 4B, PH-9500
    Quantity: 12 per pack
    Replacement Leads, Grade 3B, PH-9500
    Quantity: 12 per pack
    Replacement Leads, Grade 2B, PH-9500
    Quantity: 12 per pack
    Replacement Leads, Grade B, PH-9500
    Quantity: 12 per pack
    Replacement Leads, Grade HB, PH-9500
    Quantity: 12 per pack
    Replacement Leads, Grade F, PH-9500
    Quantity: 12 per pack
    Replacement Leads, Grade H, PH-9500
    Quantity: 12 per pack
    Replacement Leads, Grade 2H, PH-9500
    Quantity: 12 per pack
    Replacement Leads, Grade 3H, PH-9500
    Quantity: 12 per pack