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Founded in 1947, based in Renfrew Scotland, Gas Measurement Instruments designs, manufactures and markets a wide range of portable and fixed gas detectors to meet the high demands of a diverse customer base in industries where safety is critical.

GMI designs and manufactures a wide range of Portable Gas Detection Instruments to meet a variety of applications across a number of market sectors.


  • T.ex - Single Gas Monitor
  • V!SA - Confined Space Monitor

Leak Detection:

  • Gascoseeker - Gas Industry Standard Instrument
  • ppm Gasurveyor - Quick Response Leak Locator
  • GT Series - Multi-mode Gas Technician Instrument
  • FI2000 - Flame Ionisation Detector

Purging / Inerting:

  • Oxygas 500 - Purging / Inerting Control Made Easy
  • GT Series - Multi-mode Gas Technician Instrument


GMI systems engineering department has the capability to design and develop customised systems to meet individual customer requirements.

Working on projects from planning through to installation and commissioning, GMI is able to provide fixed gas detection solutions and deliver a total turnkey package.

Fixed Instruments:

  • Single Point Gas Alarm
  • Active 8
  • CO2 Multi-Monitor
  • Octigas system
  • 4500 System
  • Multi-Gas Analyser


Our specialised Service Centre in Milton Keynes, England, service calibrate and repair all GMI gas detectors past and present. Our technicians deliver a first class service for all your GMI maintenance and repair needs.

Key Features:

  • Rapid turnaround.
  • Service contracts available.
  • 24 call out available in the UK.
  • The Service Centre supplies a Calibration service for all portable GMI Instruments.
  • ISO9001 approved company.
  • GMI have a mobile Calibration Laboratory for on site calibration by our technicians, to minimise downtime.
  • GMI provide engineering and service support for our fixed gas detection systems with routine maintenance and repair provided on-site.



Registration Number: SC025020
VAT Number: GB262 8018 65
Registered at Companies House:4 February, 1947 (76 years and 10 months ago)
No of Employees: 51-100
Annual Turnover: 5-10m
Company Type:
  • Manufacturer
UK Branches: Dedicated Repair and Calibration Centre, Milton Keynes. MK8 OAJ

Opening Times

Monday 09:00 AM - 05:30 PM
Tuesday 09:00 AM - 05:30 PM
Wednesday 09:00 AM - 05:30 PM
Thursday 09:00 AM - 05:30 PM
Friday 09:00 AM - 05:30 PM
Saturday Closed
Sunday Closed

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Additional Information

Brand & Trade Names

  • Gascoseeker The industry standard instrument for the detection of flammable gas at LEL and % Volume levels.

Company Certifications

ISO 9001:2015 - Quality management systems – Requirements

Financial Information

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