testo 315-3 - CO and CO2 monitor for ambient measurements

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The high-quality testo 315-3 is an easy-to-use, ruggedly designed CO and CO2 monitor that enables you to carry out quick and reliable ambient measurements.

  • Parallel CO & CO2 measurement

  • Visual and audible alarm when thresholds are breached – adjustable thresholds

  • Extremely robust sensors

  • Conforms to the European Standard EN 50543 and British Standard BS 6173:2009


Product Description

Cutting-edge technology, easy-to-use, rugged design. These are just a few of the features which make the testo 315-3 stand out head and shoulders above the rest. The CO and CO2 monitor is designed to measure carbon monoxide and carbon dioxide parallel in heating systems and ventilation ducts. The readings are presented on an easy-to-read display. A visual and audible alarm are activated when CO/CO2 thresholds are breached. The thresholds can be adjusted to suit your range of applications.

The intelligently designed monitor has an energy-saving lithium polymer rechargeable battery and powers off automatically when not in use.

And here’s yet another practical feature: the CO and CO2 monitor for ambient measurements can also be used in combination with the testo 330-2flue gas analyzer. The CO/CO2 reading scan be transferred directly to the analyzer via the meter’s infrared interface.

Tune up your CO and CO2 monitor with a range of accessories for even more possibilities

testo 315-3 is already well equipped to meet all the demands you would put on a CO and CO2 monitor. The following accessories are designed to allow you to customize your monitor to suit your own individual requirements:

-  TopSafe protective casing: water and dirt repellent; provides testo 315-3 CO and CO2 monitor with protection in wet and dirty conditions

-  Testo turbo printer: The testo turbo printer enables you to print out on site and provide with the necessary documentation. The results are transferred to the printer via the CO and CO2 monitor’s infrared interface

-  Temperature/humidity module: allows you to carry out quick and reliable temperature and humidity measurements

Delivery Scope

CO and CO2 monitor for ambient air measurements, USB power adaptor, cable.

General Technical Data
Operating humidity                       0 to 95 %RH
Weight 200 g
190 x 65 x 40 mm
Operating temperature  0 to +40 °C
Protection class
IP40 acc. to EN 60529
Standards According to EN 50543
EU-/EG-guidelines 2004/108/EG

IRDA / optional Bluetooth
Storage battery type  
Lithium polymer rechargeable battery
Battery life
10 h measurement time (at +20 °C/+68 °F) / Mains operation possible
Battery charge
In instrument via charger
Battery charging option In instrument via mains unit
Storage temperature  -20 to +60 °C


Attachable humidity module - Capacitive
Operating temperature  +5 to +95 %RH
Accuracy ±2.5 %RH (5 to +95 %RH)
Resolution 0.1 %RH


Ambient CO?
Operating temperature 0 to 10000 ppm
Accuracy ±300 ppm (0 to 4000 ppm)
8 % of mv (4000 to 6000 ppm)
500 ppm (6000 to 10000 ppm)
Resolution 10 ppm


Ambient CO
Operating temperature 0 to 100 ppm
Accuracy ±3 ppm (0 to 20 ppm)
±5 ppm (>20 ppm)
Resolution 0.5 ppm


Operating temperature  -10 to +60 °C
Accuracy ±0.5 °C (±1 Digit)
Resolution 0.1 °C

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