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.

Features:

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