Testo 317-3 CO Detection Monitor

  • Ready to go: no zero phase
  • Alarm with adjustable thresholds
  • Compact design with belt clip for hands free operation

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The testo 317-3 ambient CO meter is small, lightweight, and provides fast and easy CO testing.

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. It detects the presence of carbon monoxide (CO) in ambient air and warns the user if potentially harmful CO concentrations are reached.

  • Testo 317-3 at a great price
  • Adjustable alarm threshold
  • Programmable high and low alarm options


Ambient CO
Measuring range0 to +1999 ppm
Accuracy±3 ppm (0 to +29 ppm)

±10 % (+30 to +1999 ppm)

Resolution1 ppm
General technical data
Operating humidity0 to 95 %rH
Reaction timet90 < 5 sec
Dimensions7 x 2 x 2 in. (without sensors) / 190 x 57 x 42 mm (without sensors)
Operating temperature39.2° to 113.0 °F / +4 to +45 °C
Heat up time30 sec
Battery type9V block battery
Battery life> 5 h
Storage temperature-4.0° to 122.0 °F / -20 to +50 °C
Weight11 oz. / 300 g