• Three CO sensor year warranty
• Visual and audible alarm warns you of dangerous CO concentrations
• No zeroing required! The self-check function verifies accurate CO measurement
• Adjustable alarm threshold
• Programmable high and low alarm options
• Easily clips to your belt for hands free convenience
• Earphone jack for loud environments

The testo 317-3 CO monitor provides fast and easy ambient carbon monoxide testing. This low cost ambient CO air quality tester measures and displays CO from 0-1999 PPM and gives warning of excessive levels with adjustable audible and visual alarms. Other handy features include: HOLD and MAX settings, and an exclusive self-check mode that verifies CO sensor response in seconds. This pocket-sized CO meter weighs only 9 ounces and can be ordered in kits that include the meter, a softcase (with belt loop), earphone, wrist strap, two AAA batteries and an instruction manual. Have confidence in your readings thanks to a three-year sensor warranty, standard.