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Product Features
  • Energy efficiency
  • Save time and money with self-calibration
  • Use data logging to analyze trends in your building
  • Real time alarms
  • Helps to reduce the spread of airborne viruses such as COVID-19
  • Power failure battery backup
  • Simple and intuitive to use
Delivery options

At Cadmus Products we aim to deliver orders efficiently and at highly competitive rates. 

  • We can ship consignments of all shapes and sizes and hazardous content across the UK and worldwide. Most of our orders are sent via DHL, however sometimes we may use other couriers.
  • If you are purchasing a laboratory product online you can find out the price of shipping checkout. If you are obtaining a quote for a product, then we will email you
    with our best shipping prices along with your quote.
  • Please see our delivery page for full information
The Air Quality Guardian 4000-0282-0001 is a reliable air quality monitor designed specifically to measure levels of carbon dioxide (CO2), relative humidity (RH) and temperature (temp) in your building.

The Air Quality Guardian helps you maintain an energy efficient building. An occupied area with good ventilation will have levels of around 400-800ppm (parts per million) CO2. Anything above this, you know you need to ventilate, anything below this and you may be over-ventilating and wasting energy.

By using the Air Quality Guardian as part of your HVAC system you can also ensure the health and wellbeing of those in the area. This unit uses a simple traffic light system to let you know at a glance when fresh air is needed. By ventilating, you are helping to reduce the risk of a virus such as COVID-19 spreading.

A fresh, clean air environment also increases productivity and strengthens the immune system.


  • Large backlit LCD screen  
  • Real time measurements of CO2, temp and RH  levels  
  • Simple 4 button navigation  
  • Ready to use - straight from the box
  • Wall mountable or desktop 
  • Low drift NDIR (Non dispersive infra-red) CO2  sensor with a long lifespan 
  • Built-in data logging 
  • Simple three-level indoor air quality indication system including: 
  • Green (under 800ppm) 
  • Amber (800ppm to 1200ppm) 
  • Red (1200ppm+) 
  • Configurable audible and visual alarms
  • Power and charge via USB 
  • 8 hour battery backup as standard 
  • Option to switch to a plant monitoring mode  (See our manual for the various options and alarm settings)


  • Schools, Universities & Academic Buildings
  • HVAC
  • Facilities Offices & Meeting Rooms
  • Conferences & Exhibitions 
  • Hospitals & Nursing Homes 
  • Gyms, Leisure Centres & Yoga Studio’s 
  • Labs 
  • Cannabis Grow Houses & Plant Nurseries
  • Restaurants, Fast Food & Bars 
  • Theatres, Cinemas & Stadiums 
  • Places of Worship 
  • Hotels 
  • Cruise Ships & Ferries 
  • Homes & Condos
  • 4000-0282-0001
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