I just sold my plx r-500...in the market for a new wideband...

Im looking for something simple and can be mounted in and out of the car easily...

I have my eyes on the LC-1 with the moates O-meter or db gauge.. but i came across the WMS and the calibration is within the chip unit itself and not free air...

What are the cons and pros of free air calibration vs the 2 wire calibration resistor built into the sensors by Bosch like in the WMS unit?

Heres the link to the wms wideband

http://www.wmsracing.com/o2/index.htm