Innovate Motorsports wideband LM-1

The LM-1 wideband has been shown to be comparable to other wideband o2 units that cost over several thousand of dollars more. The LM-1 unit uses a VW 5 wire wideband o2 sensor, which can be purchased from a dealership very inexpensively. It displays the a/f ratio along with the lambda value. 

I have used this tool to tune my a/f ratio to a safe 11.8 a/f ratio under boost. This unit also has an option to do dataloging, but I have not purchase the auxiliary input cable yet to make it useful.  

http://www.innovatemotorsports.com/lm1.php