Lascar el usb co300 carbon monoxide co data logger with usb interface lascar el usb co300 p the lascar el usb co300 is a carbon monoxide co data logger with usb interface it has been designed to measure and store up to 32 510 carbon monoxide co readings over a 0 to 300ppm measurement range and 10 to 40 deg c 14 to 104 deg f operating temperature range p p the user can easily set up the logging rate and start time and download the stored data by plugging the data logger into a