What Guymark does

Guymark is a UK-based specialist firm, founded in 1991 and headquartered in Brierley Hill, that retails, services, and calibrates audiological and occupational health diagnostic equipment. Its core capabilities span the distribution of audiology and balance assessment hardware, UKAS-accredited calibration services, technical support, and clinical training programs (including audiometry refresher, paediatric assessment, and advanced balance courses) delivered to audiologists, hearing care professionals, occupational health providers, hospitals, ENT departments, and balance clinics across the United Kingdom.

The company's service model is built around a hybrid of field-based service specialists who perform on-site support, repairs, and calibration, and skilled laboratory engineers operating from UKAS Accredited laboratories. This dual field-and-lab structure is the operational backbone of the recurring service revenue and is a key procurement criterion for NHS and regulated healthcare buyers. The business sells primarily on a quote-based pricing model with no public price list, consistent with a B2B specialist equipment and service model where contracts are negotiated per installation, per training cohort, or per calibration cycle.

In 2025, Guymark was consolidated with three other UK entities — Interacoustics UK, Amplivox UK, and Acoustic Metrology — into a single unified brand, Diatec UK, operating under the Demant Group's Demant Diagnostics Division. Guymark's previous independent identity has been subsumed into this new structure, which is intended to deliver the full Demant Diagnostics portfolio (equipment, calibration, consumables, and support) to UK customers through a single go-to-market. Guymark now operates as a constituent brand within Diatec UK rather than as a standalone commercial entity.

Name

Guymark

Legal name

Guymark

Website

https://guymark.com

Company type

Private

Founded year

1991

Operating status

Operating

Headcount range

11–50 employees

Short description

Guymark is a UK-based retailer, servicer, and calibrator of audiological and occupational health diagnostic equipment, serving audiologists, hearing care professionals, NHS hospitals, ENT departments, and occupational health providers. Founded in 1991, it now operates as a constituent brand of Diatec UK under the Demant Group's Diagnostics Division.

Ownership category

akta.pro rank

Product category

Audiology and Occupational Health Diagnostic Equipment Services

NAICS

Offices of Physical, Occupational and Speech Therapists, and Audiologists (621340), Testing Laboratories and Services (54138)

SIC

Surgical & Medical Instruments & Apparatus (3841), Services-Testing Laboratories (8734)

akta.pro primary industry

Audiology & Hearing Diagnostic Centers (HLAFAKAH)

akta.pro secondary industries

Metrology, Calibration & Testing Equipment (Balances, pH/DO, Standards) (HLAGAIAL), Calibration Services & Standards (Calibration labs, reference standards, traceability services) (IMAGAFAH)

Keywords

• Audiology equipment supply
• Hearing diagnostics services
• Equipment calibration services
• Occupational health audiology
• Medical device servicing

Headquarters

HQ city

Brierley Hill

HQ country

United Kingdom

HQ region

Europe

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Technology or R&D, Marketing or Sales

Core offering

Guymark supplies audiological and balance diagnostic equipment to UK healthcare providers, including audiometers, tympanometers, and related instrumentation. The company provides lifecycle technical support for this equipment, including on-site servicing, in-house repairs, and UKAS-accredited calibration through its laboratory engineers. It also delivers clinical training courses such as audiometry refresher, advanced balance, and paediatric assessment programmes for audiologists, occupational health nurses, ENT consultants, and hospital audiology departments.

Product overview

Diatec UK operates as a unified company formed by the consolidation of four legacy brands — Interacoustics UK, Guymark, Amplivox UK, and Acoustic Metrology — within the Demant Group. This unified entity provides a comprehensive portfolio of audiology and occupational health diagnostic solutions, encompassing equipment, calibration services, consumables, and technical support. The consolidation is designed to make it easier for audiologists, hearing care professionals, and occupational health providers to access the full Demant Diagnostics Division portfolio under a single UK brand. Guymark is referenced as one of the constituent brands within this consolidated structure, but specific Guymark-branded product pages or individual product listings were not available in the source material.

Differentiator

Problem solved

Functional benefit

Products and services

• Audiological and Balance Diagnostic Equipment Supply Supply of audiology and balance diagnostic devices drawn from the Demant Diagnostics Division portfolio (Interacoustics, Amplivox, and related brands) to UK hearing clinics, hospitals, ENT departments, balance clinics, and occupational health providers.
• Equipment Servicing and Repairs On-site servicing and in-house laboratory repairs for a comprehensive range of audiological and balance equipment, delivered by field-based service specialists and skilled laboratory engineers across the UK.
• UKAS-Accredited Calibration Calibration of audiological and balance diagnostic equipment carried out from UKAS Accredited laboratories, providing documented, accredited calibration services to UK healthcare and occupational health customers.
• Clinical Training Courses Structured clinical training for audiologists, occupational health nurses, and ENT specialists, including audiometry refresher training, advanced balance courses, and paediatric assessment masterclasses.

Named customers4 records

Segments4 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Four partnerships are on record, tiered core.

• Demant Group / Demant Diagnostics DivisioncoreStrategic or Co-development PartnerGuymark is part of four companies (Interacoustics UK, Guymark, Amplivox UK, Acoustic Metrology) that have consolidated to form Diatec UK under the Demant Group's Demant Diagnostics Division. This brings together expertise across equipment, calibration, consumables, and support services.
• Interacoustics UKcoreOthersOne of four legacy companies consolidated into Diatec UK as part of the Demant Group restructuring, bringing audiology equipment expertise.
• Amplivox UKcoreOthersOne of four legacy companies consolidated into Diatec UK, contributing occupational health diagnostic capabilities.
• Acoustic MetrologycoreOthersOne of four legacy companies consolidated into Diatec UK, providing acoustic measurement and calibration expertise.

Recent moves3 records

Expansion highlights3 records

Broad incumbents

• Otometrics (now part of Natus/Demant): Otometrics (now under Natus Medical, with hearing diagnostics interests also touched by Demant) supplies clinical audiology and vestibular/balance assessment hardware and software. It overlaps with Guymark's clinical diagnostics and balance clinic service lines as a broader incumbent in the same category.
• Tremetrics (William Demant / Bernafon-adjacent): Tremetrics is associated with occupational health hearing screening equipment within the broader William Demant/Demant ecosystem. It overlaps with Guymark's occupational health audiometry segment as a Demant-aligned incumbent in workplace hearing screening.

Direct peers

• Amplivox: Amplivox manufactures and supplies screening audiometers and occupational health hearing equipment. It is one of the four legacy entities consolidated alongside Guymark into Diatec UK under Demant, making it the closest direct peer in product and customer overlap.
• MAICO Diagnostics: MAICO Diagnostics manufactures screening and diagnostic audiometers plus tympanometry devices. It is a comparable equipment-and-service competitor serving audiology clinics, hospitals, and occupational health screening — the same customer segments Guymark targets.
• Grason-Stadler (GSI): Grason-Stadler is a long-established manufacturer of audiometers, tympanometers, and OAE equipment used in clinical audiology and ENT. It directly overlaps with Guymark's equipment distribution, calibration, and clinical audiology service offerings.
• Interacoustics: Interacoustics develops and distributes clinical audiometry, tympanometry, and balance assessment equipment worldwide. Like Guymark, it is part of the Demant Group and a sister entity consolidated into Diatec UK, with directly overlapping equipment, calibration, and clinical audiology customers.

Emerging players

• Inventis (inventis srl): Inventis designs and manufactures audiometers, tympanometers, and balance platforms for clinical audiology and ENT. As a smaller, niche-focused manufacturer, it competes with Guymark's distributed audiology equipment portfolio, especially in mid-sized clinic and hospital settings.
• Benson Medical Instruments: Benson Medical Instruments supplies occupational health audiometers and spirometry equipment primarily to US occupational health providers. It is a niche-focused competitor to Guymark's occupational health audiology screening line in adjacent markets.
• Path Medical Solutions: Path Medical supplies diagnostic audiometry, ABR/OAE screening, and hearing device fitting equipment. It is an emerging, niche-focused manufacturer with overlapping product categories to Guymark's distributed equipment lines, particularly in screening and clinical audiology.

Others

• UKAS-accredited independent calibration labs (e.g., Trescal / Trescal UK): Trescal is a global calibration services company operating UKAS-accredited laboratories across multiple measurement disciplines. It represents the broader competitive set of accredited calibration providers that Guymark competes against for outsourced audiology and acoustic equipment calibration contracts.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights5 records

Customer concentration

• Xx.com/guymarkuk

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Guymark