Who are we?

We are an Australian, 3rd generation, privately-owned company established in 1928.

We supply high-quality industrial & laboratory instrumentation and since the 1990s science & engineering teaching equipment for Australia, New Zealand and the South Pacific.

So why us?

We take great pride in our name, reputation and history, which can be attributed largely to our strong relationships with our suppliers, who have provided us with quality products, reliability of service, safety and support.

In turn, these qualities have resulted in life-time (or longer) relationships with our customers, including Defence, Power, Petrochem, Utilities, Hospitals, Research Facilities, Universities, Colleges, Manufacturing, Food & Beverage and Industry throughout the region.

Our name is paramount, and because of this, our customers are assured of quality, reliability, service and support.


On the 12th January 1928, the roots of Duff & Macintosh Pty Ltd was incorporated. Originally named Crossle, Scott & Duff Brothers Limited, the company changed its name to Duff and Macintosh Pty Ltd when Donald Urquart Macintosh joined the company in the 1930s.

Donald Macintosh was William Vere Hobart (Bill) Duff’s brother in law.

Though Duff and Macintosh was officially handed to Mr Paul Orban in 1976, Mr Macintosh continued to work with the company and made regular appearances for a further 15 years.

Today, as in 1928, the company diligently maintains its reputation in the process instrumentation market, by supplying reliable equipment from reliable suppliers.

In the last few years, Duff and Macintosh Pty Ltd embraced new suppliers in the field of training and demonstration apparatus for tertiary education institutions and have successfully expanded sales into New Zealand.

Organisations we support

IICA logo
AAEE logo
AUPEC logo
AIP logo
SIA (Science Industry Australia) logo
IAPWS (The International Association for the Properties of Water and Steam) logo
PWWA (Pacific Water and Wastewater Association) logo

What do we offer?

Flow – Electronic & Mechanical
  • Acrylic Bodied Flow Meters
  • Glass Tube Flow Meters
  • Metal Tube Flow Meters
  • Flow Transmitters
  • “Bouncing” Ball Flow Indicators
  • “Spinner” Flow Indicators
  • Brass & S/S Bodied Meters
  • Custom-Scaled Flowmeters
  • Digital Flow Meters
  • Digital Mass Flow Meters
  • Digital Mass Flow Controllers
  • Digital Volumetric Flow Meters
  • Digital Volumetric Controllers
  • Flow Switches & Alarms
  • Sight Flow Indicators
Level Transmitters & Switches
  • Level Transmitters
  • Level Switches: avail. in Polyprop., Kynar or Acetal
O.E.M. Transducers & Switches
  • Pressure Transducers
  • Level Sensors & Transmitters
  • Level Switches In PP, Kynar & Acetal
  • Force Transducers
Pressure – Sensing & Control
  • “OEM” Pressure Transducers
  • Plastic-Bodied Pressure Transducers
  • Stainless Pressure Transducers
  • Stainless Pressure Transmitters
  • Customised Pressure Sensors
  • Pressure Regulators
  • BackPressure Regulators
  • Electronic Pressure Regulators
  • Electronic Back Pressure Regulators
Process Gas Sampling
  • High Vapor Pressure Samplers
  • Liquefied Gases Sampler
  • Closed Loop Sampler
  • Manual Gas Concentration Sampler
Boiler Water/Steam/Sampling
  • Sample Coolers and Sequencers
  • Sample Panels (Wet Racks)
  • Sample Pressure Reduction
  • Thermal Shut-Off Valves
  • Degassed Cation Conductivity
  • Corrosion Products Samplers
  • Cooling Water Isolation Skids
  • Resin Columns
  • Sample Sequencers (Analyser Sharing)
  • Automated Sample Panels
Flameproof & Ex Instrumentation
  • Flow Switches
  • Level Switches
  • PressureSwitches
  • Vacuum Switches
  • Differential Pressure Switches
  • Pressure Transmitters
  • TemperatureTransmitters
  • Explosion Relief Valves
  • Transformer Valves
  • Flow Control Valves
  • Pressure Control Valves
  • High Pressure Sample Valves
  • Back Pressure Relief Valves
Education & Training Apparatus (Secondary Through To Post Graduate)
  • Aerodynamics
  • Automotive Electronics / Engineering
  • Biomedical Equipment
  • Consumer Electronics
  • Control Engineering & Sensors
  • Ecology
  • Electrical Engineering / Machines
  • Electrical Power
  • Electronics
  • Experimental Chemistry
  • Fluid Mechanics
  • Food Processing Technology
  • Industrial Chemistry
  • Industrial Process Control
  • Maritime Training Software
  • Materials Testing
  • Mechatronics
  • Robotics
  • Structures
  • Technology & Science / Principles
  • Telecommunications / Telematics
  • Theory of Machines
  • Thermodynamics
  • Renewable Energies