GM Instruments was formed in 1992 by Eric Greig to concentrate on the design and supply of specialist ENT (ORL) electronic instruments and accessories.

The initial instrument range focussed on applications which required flow and pressure measurements. This range rapidly developed and expanded into three seperate product categories, these are: Audiometry, Nasal Congestion measurements and Respiratory Flow measurements.

Innovation, prompted by PC development and interaction with medical personnel working in the field, led to the first versions of the ASRA (Automatic Self Recording Audiometer).

This was initially designed in conjunction with personnel from the University of Glasgow and became the most advanced audiometer of its time, offering one of the worlds first PC based audiometry solutions. Soon afterwards the market potential within industry for an accurate and fully automated screening audiometer, which also performed result categorisation, became apparent and significant sales followed.

Our involvement in nasal measurement first came with a rhinomanometer, which measures nasal air flow and pressure to calculate resistance. Before the formation of GM Instruments Eric was involved with Mercury Electronics who introduced the first computer based rhinomanometer (working with a BBC model B computer in 1982).

Acoustic Rhinometry was the next nasal measurement instrument to follow (again in the early 1990’s) and was developed in conjunction with personnel from the University of Aarhus (Denmark). As with rhinomanometry, development has continued to the present day, with improvements in accuracy and reductions in size being achieved.

Rhinospirometry came along in 2006, following the development of prototype units by GMI and the University of Cardiff and successful clinical trials at hospitals local to them. This unique instrument can be used to determine whether or not someone with a deviated septum will benefit from surgery. The potential to save some patients unnecessary trauma and the hospital expense, is significant.

Respiratory Flowheads, sized appropriately for adult use, have become a significant product for GMI with OEM applications in Physiology teaching, Speech analysis systems and home therapy instruments.

Our range however, is much wider than that with flowheads capable of monitoring the flows produced by baby mice at one end of the scale, up to small horses at the other. Applications in a wide range of research fields are appropriate and constantly provide interesting challenges for us.

The SMART system provides objective and immediate feedback on face mask ventilation technique; in terms of mask leak and other important respiratory parameters.

Individuals or resuscitation teams can use the specially modified term and preterm (25 week) manikins to assess their performance with both new and existing equipment.

It permits risk free practice, enabling adjustment of an individual’s technique in real time to achieve important outcomes; establish a stable, comfortable and reproducible technique; reduce mask leak; and so provide more consistent ventilation delivery.

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Lloyd Register Quality Assurance ISO13485


GM Instruments are assessed and registered by Lloyd’s Register Quality Assurance Limited (LRQA) as conforming to EN ISO 13485:2016 and are CE marked. We also hold product registrations in a number of other countries, such as the USA and Canada.

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