Image
  1. Home
  2. testo 315-4

testo 315-4 - CO measuring instrument

0632 3155
testo 315-4
testo 315-4
  • High Precision - carbon monoxide measurement in ambient air.
  • Visual & Audible Alarm - when adjustable thresholds are breached.
  • TÜV Certified - according to DIN EN 50543 standard.
  • The testo 315-4 is a high-quality, durable CO meter designed for ease of use, delivering fast and reliable ambient carbon monoxide measurements. You can, for example, detect CO in the ambient air around heating systems. It features an easy-to-read display with visual and audible alarms that activate when CO thresholds are exceeded.

    Overview

    Carbon monoxide (CO) is a colorless, odorless, and tasteless but highly toxic gas, often produced by the incomplete combustion of carbon-based fuels such as oil, gas, and solid fuels. Regular monitoring of CO emissions around heating systems and their surroundings is essential for safety and compliance.

    testo 315-4 – Precision CO Measurement

    The testo 315-4 is a state-of-the-art, easy-to-use, and robust CO measuring instrument, designed for accurate ambient air monitoring. It enables reliable detection of carbon monoxide around heating systems, with the additional capability to measure humidity and temperature in parallel.

    Measurement results are displayed clearly on a digital screen, and if CO levels exceed the user-adjustable limits, both visual and audible alarms are triggered. To enhance efficiency, the device features a lithium polymer battery with an automatic power-off function, ensuring energy-saving operation when not in use.

    Expand Your testo 315-4 with Accessories

    The testo 315-4 is built to withstand demanding conditions, with optional accessories available to extend its functionality:
    • TopSafe Protective Casing – Water and dirt-resistant for reliable operation in tough environments.
    • Testo Fast Printer – Allows on-site printouts via wireless infrared transmission for instant documentation.
    • Temperature/Humidity Module – Expands measurement capabilities to include temperature and humidity alongside CO monitoring.

    With its advanced features and accessory options, the testo 315-4 is a professional-grade solution for accurate and efficient CO monitoring in ambient air.

    testo 315-4 CO measuring instrument for ambient measurements, including USB mains unit, cable, calibration protocol.

    General technical data

    Operating humidity
    0 to 95 %RH
    Weight
    200 g
    Dimensions
    190 x 65 x 40 mm
    Operating temperature
    0 to +40 °C
    EU-/EG-guidelines
    2004/108/EG
    Interface
    IR/IRDA interface
    Storage battery type
    Lithium polymer battery pack
    Battery life
    70 h measurement time (at +20 °C/+68 °F) / Mains operation possible
    Battery charge
    In instrument via charger
    Storage temperature
    -20 to +60 °C

    Attachable humidity module - Capacitive

    Measuring range
    +5 to +95 %RH
    Accuracy
    ±25.0 %RH (5 to +95 %RH)
    Resolution
    0.1 %RH
    Contact Us
    Testo Ltd
    Newman Lane
    GU34 2URAlton
    HampshireUnited Kingdom
    01420 544433

    Opening hours

    Monday-Thursday: 8:30am - 17:00pmFriday: 8:30am - 16:00pm
    Image
    Blog

    Visit our blog

    © 2026