Calibration By Interferometry

Interferometry is the highest level of accuracy for length measurement. Offering a unique rapid turnaround service for interferometry calibrations, Avon-Dynamic Calibration are proudly one of only a few UK based laboratories offering UKAS (ISO17025) calibration of gauge blocks by Interferometry (Class A), long series gauge blocks and length bars.

Our Interferometry services are conducted at our purpose-built BS EN ISO/IEC 17025 accredited calibration and testing laboratory. The scope of our Interferometry services includes gauge blocks, long series gauge blocks, length bars, length bar accessories, optical flats and optical parallels. Our services cover tungsten carbide, steel and ceramic equipment. We will communicate with you if the equipment needs any extra repair or replacement services, but our in-house team will deliver on turnaround time and make sure your equipment is ready to be used again.

UKAS ISO 17025 Accredited Services

Gauge Blocks up to 100 mm by Interferometry

Standards: BS 4311: Part1 2007 / BS EN ISO3650:1999

  • Class A – by Interferometry
  • Class B – by Interferometry
  • Class C – by Comparison

Class “A” Calibration Uncertainty of Measurement:

  • 0.5 mm to 10 mm ±0.030 µm
  • 10 mm to 25 mm ±0.040 µm
  • 30 mm to 50 mm ±0.060 µm
  • 60 mm to 75 mm ±0.070 µm
  • 80 mm to 100 mm ±0.090 µm

Long Gauges (Length Bars & Gauge Blocks) by Comparison and Laser Interferometry

Standards: BS 5317: 1976 / BS 1790: 1961 / BS EN ISO3650:1999

  • Size range: 100 mm to 1000 mm
  • Uncertainty of Measurement: ± 0.20 + (1.0 x length in m) µm

Optical Parallels by Interferometry

  • Size range: 10 mm to 100 mm
  • Uncertainty of Measurement: Flatness & Parallelism ± 0.042 µm / Length ± 0.10 µm

Optical Flats by Interferometry

  • Size range: 10 mm to 100 mm
  • Uncertainty of Measurement: Flatness ± 0.042 µm

For more information or a fast quote, call us on 0117 947 7846 or email [email protected].

UKAS approved Coordinate Measuring Machine (CMM)

Component Inspection

We provide an on-site and laboratory component inspection service through our CMM calibration machines. We cover a range of component inspection sizes, from micro components that can be measured with our precise Coordinate Measuring Machine (CMM), to oversize on-site jigs and fixtures inspection, via our mobile certified portable arm coordinate measuring machine (CMM).

Faro Platinum Arm for component measurement

Jig & Fixture Certification

As the UK’s first UKAS-accredited jigs and fixture certification laboratory performing on-site at customer facilities, we know how to deliver on-site certification, no matter how small or large the fixture or jig. We provide you with full UKAS-certification, guaranteeing your jigs and fixtures are fit for purpose.

UKAS calibration of electrical measurement equipment

Equipment Repair and Supply

We are able to source any calibration or measurement equipment, from simple gauges to a complex measurement system. We source with a focus on performance, best return on investment, and lifetime project costs.

Avon Dynamic Office

Managed Services

We offer a fully managed service that allows you to focus on your day-to-day operations, safe in the knowledge we have all your calibration and inspection equipment requirements covered. From the identification of all your assets, monthly collection and delivery of recalibrated equipment, to the calibration and certification of all quality verification equipment on your engineering and manufacturing sites.

coordinate measuring machine (CMM) for component measurement


Advisory support comes in a vast range of types and complexity, but all follow the same theme of improving the calibration and measurement activity for clients. At Avon-Dynamic, we have spent 30 years investing in the innovation and development of the best calibration and measurement processes, procedures and equipment.

Metrology Centre at Avon Dynamic

Metrology Centre

Our unique Metrology Centre, based at our UK headquarters in Bristol, demonstrates our commitment to innovation in measurement and calibration. We have partnered with some of the UK’s best equipment suppliers and combined both our real-life and industry experience to create an environment for customers to see the latest equipment and understand best processes.