A measuring device for setting up powered wood tools and the like includes an elongated body defining a straight edge adapted to abuttingly support the measuring device on a bed of the wood forming machine adjacent the cutter head of the machine. Some injectors may include a multimedia tube configured to pass a working fluid and a light signal. At a point in time when the air pressure inside the air-storage tank has decreased from the first set pressure to a second set pressure, a starter motor is started up to resume the operation of the engine.