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

Order-Nr.  0632 3153

  • High-precision electrochemical CO sensor, shock resistant infrared CO2 sensor

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

  • Rugged design

  • Rugged sensors

The high-quality testo 315-3 is an easy to use, ruggedly designed CO and CO2 meter for quick and reliable ambient measurements according to DIN EN 50543 standard.


Product Description

Cutting edge technology, easy to use, rugged design. These are just some of the features which make the testo 315-3 stand out head and shoulders above the rest. The CO and CO2 meter can 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 is activated when CO/CO2 thresholds are breached. The thresholds can be adjusted to suit your range of applications.
This intelligently designed meter has an energy-saving lithium polymer rechargeable battery and powers off automatically when not in use.
The CO and CO2 meter can also be used in combination with the testo 330-2 flue gas analyzer. The CO and CO2 readings can be transferred directly to the analyzer via the meter’s infrared interface.

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

Your testo 315-3 is equipped to meet all the demands you would put on a CO and CO2 meter. The following accessories allow you to customize your meter to suit your own individual requirements:
  • TopSafe protective casing: water/dirt repellent; for protection in wet and dirty conditions
  • Testo turbo printer: provide your customers with the documentation they need with on site print outs. The results are transferred to the printer via the CO and CO2 meter’s infrared interface
  • Temperature/humidity module: for quick and reliable temperature/humidity measurements

Delivery Scope

testo 315-3 CO and CO2 meter for ambient air measurements, USB power adaptor, cable

Technical Data

General technical data

Operating humidity

0 to 95 %rH


7 oz. / 200 g


7 x 3 x 2 in. / 190 x 65 x 40 mm

Operating temperature

32° to 104 °F / 0 to +40 °C

Protection class

IP40 acc. to EN 60529


According to EN 50543




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

-4° to 140 °F / -20 to +60 °C

Attachable humidity module - Capacitive

Measuring range

5 to 95 %rH


±2.5 %rH (5 to +95 %rH)


0.1 %rH

Ambient CO₂

Measuring range

0 to 10000 ppm


±300 ppm (0 to 4000 ppm)

8 % of mv (4000 to 6000 ppm)

500 ppm (6000 to 10000 ppm)


10 ppm

Ambient CO

Measuring range

0 to 100 ppm


±3 ppm (0 to 20 ppm)

±5 ppm (>20 ppm)


0.5 ppm


Measuring range

14° to 140 °F / -10 to +60 °C


±0.9 °F (±1 Digit) / ±0.5 °C (±1 Digit)


0.1 °F / 0.1 °C




Order Number: 0636 9725



$ 24.00
excl. tax

Order Number: 0516 0191

$ 65.00
excl. tax
Topsafe testo 315-3

Order Number: 0516 0223

Spare thermal paper, permanent ink

Order Number: 0554 0568

USB power supply including cable

Order Number: 0554 1105


Order Number: 0636 9725