As predicted, this one was a cinch. Roastbeef posted a correct answer within an hour of the contest going up. Congratulations Roastbeef! I got a rise out of your comment about the improperly named reference designator. And in fact, James Walter guessed the exact model of the G-meter, the G-tech Pro (how do you guys do that?). I got this as a novelty item on loan from a friend of mine to test out in my car. It’s probably the most direct application of freshman physics and the integral that I’ve ever seen…the device measures your acceleration, and from there it integrates over time and infers your position and velocity. Given these values, it reports statistics such as your 0-60 mph times, your quarter-mile performance, and the effective horsepower of your car. It’s suprisingly accurate and robust (so long as you have it mounted correctly–it only measures acceleration along a single axis), although I’ll have to say I wasn’t able to pull off the advertised 4.8 second 0-60 time for my car (almost certainly due to operator error, since I was breaking traction on second gear every time I tried). Thanks again to everyone for playing!