The R-300 is a compact, dash mountable, easy to use wideband air/fuel controller with powerful data logging capabilities. Wideband air/fuel ratio can be monitored in numeric, gauge or graphical form. Data logger inputs can be fully customized to display virtually ANY type of data. It's like combining 6 gauges into one! The R-300 can store up to 90 minutes of logged data and 99 individual sessions for later PC download and analysis with PLX Logger PC software.