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Pinecar Performance & Conformity System Portable, digital scale and conformity gauge keep you up to speed on your racers weight and dimensions. Instantly check car weight to within .01 of an ounce. Measure overall width and length, width between wheels, track clearance and locate the cars center of gravity with the handy fulcrum point. Use the mathematical formulas and simple table to determine optimum placement for your cars center of gravity (CoG). Adjust for optimum speed and stability. Batteries included.