The EA80 measures carbon dioxide concentrations with a maintenance-free dual wave NDIR (non-dispersive infrared) CO2 sensor that ranges from 0 to 6,000 PPM. It can automatically record up to 20,000 data sets or manually enter up to 99 sets for subsequent recall. Additional functions include automatic power off, data hold, max/min with time stamp, and alert. Includes six AAA batteries, Windows 95/98/NT/2000/ME/XP compatible software, and an RS-232 interface cable.