by fivebob » Mon Apr 03, 2006 7:35 pm
Either of these units will give farily accurate results except that the RSM will take into account wheelspin if you have the G sensor.
The G sensor in the RSM does not take into account vertical G's from the test section not being on level ground, so it is not really any better in that respect. You will still get variances in the readings if you don't conduct you tests over the same section of road, preferably flat with runs done in both directions and averaged out.
I have used both and prefer the Blitz and it's a more compact unit and easier to install as it only requires Power, Earth and Speed signal inputs.