I have this one, i bought it from northridge 4x4.
I would not use it if u have the time and get some else. The paint on it is not the best grounding and the area you mount it does not have a good grounding either. I had to sand the paint off from it to get a better reading but now the area with out the paint is rusting.
But in the end it works and i dont care any more lol.
Anton