CO10
Displays CO levels from 0 to 1000ppm, Auto Zero Start Up, Easy to read 1999 count backlit displays, 1ppm resolution with ±5% or ±10ppm basic accuracy (whichever is greater), Utilizes a stabilized electrochemical gas specific (CO) fast response sensor, Audible alarm starts at 35ppm, Memory Stores 10 Readings, Backlight for low light conditions, Complete with 9V battery, Holster, & Case.