•Fast response CO measurements from 0 to 1000 ppm. •Easy to read backlit display. •1 ppm resolution with ±5% or ±10 ppm accuracy (whichever is greater). •Uses a stabilized electrochemical gas specific (CO) fast response sensor. •Audible alarm starts at 35 ppm. •Max hold and data hold buttons. •Auto power off. •Pocket sized housing. •Dimensions: 6.3 x 2.2 x 1.6” •Complete with 9V battery and carrying case. •1 year warranty.