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Do you have one of those smart phones? I have seen a program for them that makes them an inclinometer using their internal accelerometers. Impressive gadgets they are.
Just make sure you measure the "level" part at the top of the ramp, in addition to the ramp, then take the difference. This will make sure you are not adding the un-level-ness of the whole theater to the ramp slope.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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