CO,CO₂,light and sound

Everyone is exposed to different environmental influences in their day-to-day lives. For example, in an average workplace illuminance, sound level, and indoor air quality are all significant factors that influence people's performance and well-being. Testo offers suitable measuring instruments for controlling each of the measurement parameters of lux, sound, and CO2 (for indoor air quality).

74 products or recommendations for CO
  • testo 425 - Hot wire anemometer

    Order-Nr. 0560 4251

    The testo 425 hot wire anemometer can measure cubic feet per minute (CFM) when conducting duct testing, as well as easily switch between flow and temperature readings. The telescoping handle of the thermal probe on this CFM meter makes it easy to reach ductwork above your head.
    • Telescoping hot wire probe

    • Measures velocity, volume flow (CFM), and temperature

    • Timed and multi-point average flow calculations

    • Auto-off function saves battery life

  • testo 540 - Light meter

    Order-Nr. 0560 0540

    The testo 540 light meter is a quick and easy to use entry level model for measuring lighting conditions in the workplace.
    • For quick and easy measurements in the workplace

    • Sensor based on the spectral sensitivity of the human eye

    • Hold function, min/max values

    • Protective cap for safe storage

  • testo 405i - Hot-wire anemometer wireless Smart Probe

    Order-Nr. 0560 1405

    The testo 405i Smart Probe is a wireless instrument for measuring air flow velocity, temperature, and volume flow.  It is equipped with a telescopic shaft, which extends to 15” for easy in-duct testing.  You can reliably determine timed and multipoint flow traverses.
    • Measures air velocity, volume flow, and temperature

    • Measures in-duct air flow, and automatically calculates volume flow (simply enter the duct dimensions)

    • Small diameter (<0.5”) and 15” telescopic shaft length is ideal for in-duct flow averaging and timed traverse

    • Perform air duct leakage tests

  • testo 440 - Hot wire kit (Ø 0.35")

    Order-Nr. 0563 4400

    This testo 440 kit is great for carrying out measurements in ventilation ducts. The testo 440 air velocity and IAQ measuring instrument and its hot wire probe (Ø 0.35") with temperature sensor can all be safely stored in the included case.
    • Intuitive: Clearly structured measurement menus for volume flow, parallel determination of air velocity, and air temperature in ventilation ducts

    • Convenient: Integrated telescope with scaling can be extended up to 2.8 feet, making it easy to carry out all kinds of measurements

    • Reliable: Absolute pressure compensation, internal memory for data storage, and USB port for data export

    • Versatile: Your testo 440 setup can be expanded with a large selection of digital probes

  • testo 440 - Vane kit (Ø 0.63")

    Order-Nr. 0563 4401

    This testo 440 kit is great for carrying out measurements in ventilation ducts. The testo 440 air velocity and IAQ measuring instrument and its vane probe (Ø 0.63") can all be safely stored in the included case.
    • Intuitive: Clearly structured measurement menus for volume flow and determination of air velocity in ventilation ducts

    • Convenient: Integrated telescope with scaling can be extended up to 2.8 feet, making it easy to carry out all kinds of measurements

    • Reliable: Internal memory for data storage and USB port for data export

    • Versatile: Your testo 440 setup can be expanded with a large selection of digital probes

  • testo 405 - Pocket-sized thermal anemometer

    Order-Nr. 0560 4053

    Use the testo 405 thermal anemometer to measure air velocity, volumetric flow, and air temperature. It is suitable for carrying out quick check measurements in ventilation ducts, and for measuring the air velocity in rooms, such as at drafty windows.
    • Volume flow calculation of up to 99,990 m3/h

    • Easily read data at any angle with rotating display

    • Telescopic handle up to 300 mm

    • Ideal for measurements in ducts

  • testo 440 - Vane kit with Bluetooth (Ø 3.9")

    Order-Nr. 0563 4403

    This testo 440 kit is great for carrying out measurements at air outlets. The testo 440 air velocity and IAQ measuring instrument and its vane probe (Ø 3.9") with temperature sensor can all be safely stored in the included case.
    • Intuitive: Clearly structured measurement menus for volume flow, parallel determination of air velocity, and air temperature in ventilation ducts or at air outlets

    • Precise: Combine the Bluetooth vane probe with the extendable telescope for ceiling outlets, or the funnel set for plate outlets as needed (both sold separately)

    • Convenient: Wireless probe, internal memory for data storage, and USB port for data export

    • Versatile: Your testo 440 setup can be expanded with a large selection of digital probes

  • testo 440 - CO2 kit with Bluetooth

    Order-Nr. 0563 4405

    This testo 440 kit is great for carrying out indoor air quality measurements. The testo 440 air velocity and IAQ measuring instrument and its CO2 probe with humidity/temperature sensor can all be safely stored in the included case.
    • Intuitive: Clearly structured measurement menus for long-term measurements and parallel determination of CO2 concentration, humidity, and air temperature in indoor areas

    • Precise: Absolute pressure compensation, calculation of wet bulb temperature, dew point, and absolute humidity

    • Convenient: Wireless probes, internal memory for data storage, and USB port for data export

    • Versatile: Your testo 440 setup can be expanded with a large selection of digital probes

  • testo 440 - Air flow ComboKit 1 with Bluetooth

    Order-Nr. 0563 4406

    This testo 440 kit is great for carrying out measurements in ventilation ducts and at air outlets. The testo 440 air velocity and IAQ measuring instrument, its vane probe (Ø 3.9") with Bluetooth and temperature sensor, and hot wire probe including temperature sensor can all be safely stored in the included case.
    • Intuitive: Clearly structured measurement menus for volume flow and parallel determination of air velocity, humidity, and temperature in ventilation ducts, or at ventilation outlets

    • Clever: Hot wire probe (Ø 0.35") with telescope (2.8') – combine the Bluetooth vane probe (Ø 3.9") with the telescope for ceiling outlets, or the funnel set for plate outlets (sold separately)

    • Convenient: Wireless probes, internal memory for data storage, and USB port for data export

    • Versatile: Your testo 440 setup can be expanded with a large selection of digital probes

  • testo 440 - Air flow ComboKit 2 with Bluetooth

    Order-Nr. 0563 4407

    This testo 440 kit is great for carrying out measurements in ventilation ducts and at air outlets. The testo 440 air velocity and IAQ measuring instrument and its vane probes can all be safely stored in the included case.
    • Intuitive: Clearly structured measurement menus for volume flow and determination of air velocity, humidity, and temperature in ventilation ducts, or at ventilation outlets

    • Clever: Vane probe (Ø 0.63") with telescope (2.8') – combine the Bluetooth vane probe (Ø 3.9") with the telescope for ceiling outlets, or the funnel set for plate outlets (sold separately)

    • Convenient: Wireless probes, internal memory for data storage, and USB port for data export

    • Versatile: Your testo 440 setup can be expanded with a large selection of digital probes

  • testo 440 - Indoor comfort ComboKit with Bluetooth

    Order-Nr. 0563 4408

    This testo 440 kit is great for evaluating indoor air quality and determining draft risk and degree of turbulence in workplaces. The testo 440 air velocity and IAQ measuring instrument and its CO2 probe with humidity/temperature sensor and turbulence probe can all be safely stored in the included case.
    • Intuitive: Clearly structured measurement menus for long-term measurement and parallel determination of CO2 concentration, humidity, air temperature, and degree of turbulence in workplaces

    • Precise: Calculation of wet bulb temperature, dew point, and absolute humidity – determination of the degree of turbulence and draft risk according to EN ISO 7730 / ASHRAE 55

    • Convenient: Wireless probes, internal memory for data storage, and USB port for data export

    • Versatile: Your testo 440 setup can be expanded with a large selection of digital probes

  • testo 440 dP - Air flow ComboKit 1 with Bluetooth and delta P

    Order-Nr. 0563 4409

    Carry out measurements without any annoying cables: use the kit to handle all relevant measurements in ventilation ducts and at air/ceiling outlets. You will receive the testo 440 dP air velocity and IAQ measuring instrument including differential pressure sensor and the 100 mm vane probe head and hot wire probe head (Ø 9 mm) for attachment to the universal Bluetooth® handle supplied. To make measurements more convenient, both probe heads can be combined with the telescope included in the kit. The equipment can be transported safely and conveniently in the robust case.
    • Intuitive: clearly structured measurement menu for volume flow and parallel determination of air velocity, differential pressure, humidity and temperature in ventilation ducts or at ventilation outlets

    • Space-saving: simply combine the universal Bluetooth handle with the 100 mm vane or hot wire probe head and the extendable telescope (1.0 m)

    • Convenient: wireless probes, internal data storage and USB port for data export

    • As multifaceted as your challenges themselves: the testo 440 dP has an integrated differential pressure sensor and can be expanded with a large portfolio of digital probes

  • testo 440 dP - Air flow ComboKit 2 with Bluetooth and delta P

    Order-Nr. 0563 4410

    Carry out measurements without any annoying cables: use the kit to handle all relevant measurements in ventilation ducts and at air/ceiling outlets. You will receive the testo 440 dP air velocity and IAQ measuring instrument including differential pressure sensor, two vane probe heads (Ø 100 mm and Ø 16 mm) and a humidity/temperature probe head – all three can be attached to the universal Bluetooth® handle supplied. To make measurements more convenient, both vane probe heads can be combined with the telescope included in the kit. The equipment can be transported safely and conveniently in the robust case.
    • Intuitive: clearly structured measurement menu for volume flow and parallel determination of air velocity, differential pressure, humidity and temperature in ventilation ducts, at ventilation outlets and in work rooms

    • Space-saving: combine the universal Bluetooth handle with the humidity/temperature probe head or extendable telescope (1.0 m). Vane probe heads (Ø 16 mm, Ø 100 mm) can simply be plugged onto the telescope

    • Convenient: wireless probes, internal data storage and USB port for data export

    • As multifaceted as your challenges themselves: the testo 440 dP has an integrated differential pressure sensor and can be expanded with a large portfolio of digital probes

  • testo 416 - Small vane anemometer

    Order-Nr. 0560 4160

    The testo 416 small vane anemometer (air flow meter) accurately and easily measures air velocity and volume flow (CFM) for in-duct and a variety of HVAC applications above 120 fpm. As vane technology is inherently air density independent, the testo 416 handheld digital vane anemometer provides repeatable and reliable readings test after test.
    • Small (0.63 inch) vane for in-duct measurement

    • Direct display of volume flow (CFM)

    • Multi-point and timed average calculations make fast and simple work of duct traverses

    • Bright backlit display provides easy viewing in any environment

  • testo 480 - Digital temperature and humidity meter

    Order-Nr. 0563 4800

    Air flow measurements in ventilation ducts, temperature measurements in laboratories, humidity measurements in production, pressure difference measurements in clean rooms – the testo 480 temperature and humidity meter comes with a wide range of optional sensors that allow you to measure, analyze, and log these and a variety of other parameters with only one device.
    • High quality optional sensors for measuring air flow / temperature / humidity / pressure / degree of turbulence / heat radiation / CO2 / illumination intensity / PMV / PPD / WBGT

    • High precision, integrated pressure difference sensor included

    • Pro-software for easy and efficient analysis and logging included

    • Intelligent calibration concept

  • testo 410-2 - Vane anemometer with humidity measurement

    Order-Nr. 0560 4102

    The testo 410-2 handheld anemometer with humidity measures air flow, air temperature, and humidity quickly, easily, and accurately. The compact testo 410-2 air and humidity meter is ideal for fast comfort spot checks and timed averaging calculation.
    • Integrated RH sensor provides %rH, wet bulb, and dew point readings

    • Small 1.5 inch vane meter

    • Hold, Min, Max, and Timed averaging

    • Lens cover and leather belt case keep it protected - even in your tool box

  • testo 410-1 - Vane anemometer

    Order-Nr. 0560 4101

    The testo 410-1 pocket anemometer measures air flow and air temperature quickly, easily, and accurately. The integrated 1.5 inch vane makes this economical air flow instrument ideal for fast air velocity measurement spot checks.
    • Integrated, small 1.5 inch vane

    • Hold, Min, Max, and Timed averaging

    • Bright backlit display for easy viewing, no matter the environment

    • Lens cover and leather belt case keep it protected

  • testo 317-3 - Ambient CO meter

    Order-Nr. 0632 3173

    The testo 317-3 ambient CO meter detects the presence of carbon monoxide (CO) in ambient air, and warns the user if potentially harmful CO concentrations are reached.  With programmable settings for both visual and audible alarms, as well as hands free operation, ambient CO testing during furnace and boiler service and maintenance, weatherization audits, or home inspections has never been easier.
    • No zeroing required

    • Audible and visual programmable alarms

    • Compact design with belt clip for hands free operation

    • Easy to read backlit display

  • testo 435-4 - Multifunction meter w/ memory, software, and differential pressure

    Order-Nr. 0563 4354

    The testo 435-4 multifunction meter is perfect for monitoring, analyzing, and diagnosing indoor air quality, wherever you need to take important IAQ measurements. In addition, you can easily pinpoint and troubleshoot problems with HVAC systems, and immediately see the results of corrections. Commissioning, validating, benchmarking, or simpy adjusting HVAC systems are all easy with the testo 435-4.
    • Integrated differential pressure measurements for flow velocity

    • Optional wireless (RF) temperature and humidity probes for remote measurement

    • Backlit LCD for easy viewing

    • Built-in memory stores up to 10,000 measurements

  • testo 410i - Vane anemometer wireless Smart Probe

    Order-Nr. 0560 1410

    The testo 410i Smart Probe is a compact wireless vane anemometer for measuring air velocity, temperature, and deriving volume flow.  It can be used at air outlets, and for monitoring the air flow of ventilation systems.
    • Measures air velocity, volume flow, and temperature, as well as air flow at registers, and automatically calculates volume flow (simply enter the duct dimensions)

    • No air density correction required, due to its design

    • Measure volume flow at several outlets simultaneously (using mutiple Smart Probes), to adjust system balance

    • Timed/multipoint averaging to get accurate air flow profiles

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