testo 317-3 - Ambient CO meter

Order-Nr.  0632 3173

  • Ready to go: no zero phase

  • Alarm with adjustable thresholds

  • Compact design with belt clip for hands free operation

  • 3-year CO sensor warranty

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.


Product Description

The testo 317-3 ambient CO meter provides fast and easy CO testing with a small, lightweight form factor.  An exclusive self-test mode provides worry-free operation, as it will always verify that the CO sensor is functioning, anytime and anywhere, without the need for test gas.  In addition, the self-check will ensure accurate CO measurements, without the need to “zero” out the unit in a fresh air environment.

  • Three year CO sensor warranty
  • Adjustable alarm threshold
  • Programmable high and low alarm options
  • Earphone jack, and earbuds for loud environments
  • Hands free operation with belt clip soft case

Delivery Scope

testo 317-3 ambient CO meter, soft case with belt clip, hand strap, earbuds, 2 AA batteries, and instruction manual

Technical Data

General technical data

Operating temperature

23° to 113 °F / -5 to +45 °C

Battery type

2 AAA batteries

Battery life

150 h (with beeper switched off)

Storage temperature

-4° to 113 °F / -20 to +45 °C

Ambient CO

Measuring range

0 to +1999 ppm


±3 ppm (0 to +29 ppm)

±10 % (+30 to +1999 ppm)


1 ppm