The 317-3 CO Stick measures and displays carbon monoxide (CO) from 0 to 1,999 ppm and gives warning of excessive levels with adjustable audible and visual alarms. It has a self-check mode that verifies CO sensor response in seconds, the company says. This CO tester features a CO-concentration tick rate that can be turned on and off. The pocket-sized meter can be ordered in contractor kits that include the meter, a soft case with belt loop, earphone, wrist strap, two AAA batteries, and an instruction manual. The unit weighs 9 ounces and is available with a three-year sensor warranty (two years on the instrument).

Testo Instruments, 35 Ironia Rd., Flanders, NJ 07836; 973-252-1720; 973-252-1729 (fax);

eProduct #188