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NDT MainCal Ltd

NDT MainCal can offer a cost-effective service through the provision of a one-stop shop for all of your NDT Calibration, repair and Radiation Protection requirements.

Product, Service

United Kingdom

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NDT MainCal Ltd Established 1991

A specialist NDT related equipment calibration house for the NDT industry. The founders brought more than 100 hundred years of NDT experience to the company.

Over the years the NDT MainCal customer base has grown to include a diverse range of businesses ranging from self-employed NDT technicians to blue chip companies located worldwide.

In response to customer needs our range of services has also expanded to include Radiation Protection Advisory services, bespoke equipment manufacture and supply of radiography enclosures/cabinets & associated safety systems.

Other services such as NDT Level 3 consultancy and formal NDT technician training are available through our trading partners.

NDT MainCal Expansion in 2012

In 2012 having outgrown our original premises in New Mills we moved to our current state of the art facility in Whaley Bridge, Derbyshire. Here our highly skilled workforce offers NDT equipment calibration, repair and maintenance of all types of NDT equipment.

Also as NDT industry specialists we offer free friendly advice on such matters as customer specific calibration procedures, to help meet the requirements of accreditation bodies such as NADCAP, or radiation protection advice, to meet the requirements of the Ionising Radiation Regulations.

Cost Effective NDT Calibration, Repair & Radiation Protection Services.

NDT MainCal can offer a cost effective service through the provision of a one-stop shop for all of your NDT Calibration, repair and Radiation Protection requirements

NDT MainCal Focus On:

  • Customer service
  • Quality
  • Knowledgeable and experienced staff
  • Keen pricing
  • Fast turn around

Our focus keeps our business growing

We also provide training tailored to the needs of Managers, Technicians and Radiation Protection Supervisors either on site or at our Whaley Bridge headquarters.

Whilst NDT related clients remain a major part of our customer base, we service a wide range of RPA customers in other sectors including the public sector.

Products & Services
NDT Equipment Calibration & Repair

We calibrate and repair NDT equipment in accordance with a variety of standards.

Equipment we routinely calibrate and repair includes:

  • Ultrasonic flaw detectors
  • Ultrasonic thickness meters
  • Bond testers
  • Eddy current flaw detectors
  • Photometers and radiometers
  • Conductivity meters and blocks
  • MPI equipment
  • Dye Penetrant Lines
  • Radiation Monitors

Calibration Services

Almost any type, make or model of NDT instrument can be calibrated at our laboratory. Calibrations are carried out in accordance with a variety of standards varying from national and international standards through manufacturer specification to customer and primary contractor generated procedures under our ISO 9001 quality system.

As part of our contract review process we are of course happy to assist with specifying both calibration and reporting requirements to satisfy the requirements of accreditation bodies such as NADCAP & UKAS.


NDT MainCal Ltd is recognised by the HSE as a Radiation Protection Advisory Body under the requirements of the Ionising Radiations Regulations 2017.

The principal RPA at NDT MainCal Ltd is Mr. Simon Wright.
Should you wish to appoint us as your RPA, follow the links to view a standard letter outlining our scope of RPA advice, along with a letter of appointment to be completed and returned to us.

Radiation Enclosure Services Consultancy through to critical examination.

Radiation Safety Training


The Ionising Radiation Regulations 2017 place great emphasis on employers providing suitable information, instruction and training to everyone involved in the use of ionising radiation.

If your company uses equipment such as X-ray generators or radioactive sources then you are a 'radiation employer' and you are involved, whether you are a senior manager, safety officer, foreman or a technician directly using the equipment.

Company directors, senior managers, employees not directly working with radiation


  • Basic concepts of radiation
  • Types of equipment used
  • Quantities and units
  • Biological effects of radiation
  • Dose measurement and recording
  • Practical radiation protection
  • Emergency procedures
  • Transport of radioactive substances


Under conditions where a full 'ADR' hazardous goods licence is not required for transport of radioactive material, e.g. a type 'A' industrial radiography source, the employer must still provide appropriate training for the driver.

Our radiation training safety course is designed to help the employer fulfil this obligation. Topics covered include; an overview of the transport regulations, packaging and labelling, transport documents, vehicle placarding, driver responsibilities and emergency plans.


In the practice of industrial radiography, there is significant risk of a sealed source failing to return to its container. The employer must prepare contingency plans for such a situation and must ensure that adequate training is given to anyone likely to be involved.

Our radiation safety training course has been prepared to help an employer meet this requirement. Topics covered include; causes and prevention of non-return, immediate actions, emergency equipment, recovery plans, stay-time calculations, dosimetry and reporting. A practical session on source recovery can also be arranged.

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