Some Product Qualities of a car. Cost, comfort, acceleration, braking ability, its precision in steering, fuel mileage, style and beauty, its maintenance costs, road handling, ease of opening the hood, intuitiveness of the air-conditioner, intuitiveness of adjusting the seats, space, environmental pollution, quietness, etc., as well as customer satisfaction, friendly sales staff, image etc. are all examples of what I call Product Qualities that we might evaluate when buying a car.
Scale: average time in minutes, to install, the system.
Meter: have 3 people install the system, time them, and average the time.
Past  120 min.
Goal  30 min.
see Scale db for an extensive list of examples.