The all new G-TECH/Pro Performance Meter is a cutting edge tuning tool designed to make a professional test driver out of you. It measures all performance characteristics of your car in a matter of minutes with absolutely no installation or wiring (Can be hardwired if desired). It will give you all the answers you always wanted before and after your modifications. How does it work? Acceleration: At the heart of G-TECH/Pro is a precision 3-axis accelerometer, a sensor that measures acceleration also known as G-Force. G-Force is what's keeping you in your seat and if it wasn't for that seat you would be accelerating to the ground at 1 G (32 feet per second per second). Acceleration is measured in Gs and is one of the key things the G-TECH/Pro COMPETITION is measuring. You can see this when you position the unit horizontally, it will show 0.00G's on the X acceleration bar. If you position it vertically it will show 1.00G's. Speed: The G-Tech measures your speed and distance travelled by integrating forward (the forward direction is chosen automatically) acceleration over time. Basically, if you know how fast you are accelerating for a certain time period you'll know how much your speed changed after that time period. So if you start off from zero speed then you'll know what your speed is after every time period. These time periods are very small (a few thousandths of a second) and that's how G-Tech maintains its accuracy. However, if you don't start from zero speed your measurement won't be correct because you won't have a good reference point. Consequently, it's very important to start all of your measurements from an absolute standstill. Distance: Distance is measured in the same fashion, if you know how fast you are going for a certain time period you will know what is the distance travelled during that time period. Horsepower: The G-Tech measures horsepower though the formula: speed times acceleration times the weight of the vehicle. The more accurate the vehicle weight you enter, the better your measurement. The G-Tech measures delivered horsepower, sometimes also called Rear Wheel Horsepower. This horsepower includes the loss of power through the drivetrain which is usually 10-15%. Rear Wheel Horsepower is what most people are interested in because that is what they experience when driving. The use of Flywheel Horsepower measurement is often used in advertising, but not very realistic when it comes to accelerating your vehicle. The horsepower that G-Tech measures also includes vehicle aerodynamic drag. This means that if you tape over your headlights and grill, remove rear view mirrors and windshield wipers to reduce your drag, you will measure a Horsepower increase even though you didn't make any changes to the engine. After adding an aftermarket spoiler you will likely find a decrease in measured horsepower, since you increased the drag losses on your vehicle. RPM: Engine RPMs are sensed directly from the cigarette lighter voltage. No installation required at all with this true plug and play feature. The unique RPM feature is used for anything from realtime torque measurements to shiftlights. What can it do? 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 analysing 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 How accurate is it? There are several significant improvements over the original G-TECH/Pro Performance Meter that have been implemented in the new COMPETITION model. First of all, there are 3 accelerometers and they are fully temperature compensated. This in itself is a huge improvement in accuracy. Secondly there is a very sophisticated new calibration algorithm that allows much higher precision. Also the system now has 32 times higher resolution which speaks for itself. New Noise-Correction algorithms have improved overall accuracy as well. With all of these valuable features the accuracy is now within 5/100 second. With the consistency at 5/1000 of a second! Absolute Horsepower and Torque measurement are within 3% and consistency within .5%!