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I have tried both the Brockway and the APEX i-moni. They all work as advertised. The Brockway is also a code scanner. The I-moni just puts out readings from various sensors.
The biggest problem with these things is their physical size. That one you are asking about is 2" thick. It's is nearly impossible to find a convenient location on this car to mount it and still be able to read it well.
I ended up settling for the I-moni since it is very small and it mounts very conveniently in the Panavise mount.
Here is the Brockway:
The above is not mounted. I simply could not find anywhere to put it. Also, the LED display on this is not bright enough to read in daylight.
Here is the I-moni mounted on the Panavise:
This is a much better set up, but if you need a code scanner, this won't do for you.