According to their website, the new G-Tech Pro Competition does a lot more than the G-Tech Pro, but the Competition costs $250. The Pro only measures 0-60, 1/4 time, rwhp, g's, and braking distance. Here is what the website says about the Competition version:
The new G-TECH/Pro Performance Meter COMPETITION is a very sophisticated, cutting edge automotive tuning instrument. Weather you want simple RPM recording or complete Data-Acquisition. As an automotive enthusiast you will find recording acceleration runs and analyzing shift points, delivered horsepower and reaction times extremely valuable. Just imagine, having all that power of knowledge right there under your fingertips any time you want it, that's the new G-TECH/Pro COMPETITION. So, no more confusion after making modifications now simply get the results "before and after".
Measurements:
Reaction-Time
0-60ft time
0-330ft time
0-60mph time
1/8mile E.T and speed
1000ft time
1/4 mile E.T. and speed
Horsepower
Torque
RPMs
Braking distance
Handling G's
Accelerating and Braking Gs
RPM vs Time Graph
HP & Torque vs RPM Graph
Speed vs Time Graph
Speed vs Distance
Gs vs Time Graph
The Pro is a real bargain price now though.