Devices are provided to measure the mass inertia of moving surfaces (e.g., aircraft components). In certain embodiments, the devices will include a support frame formed by first and second structural frame members which form a space for positioning of a moving surface to be measured for mass inertia. A pivot joint assembly is supported by an upper portion of the first structural frame member while a distance alignment device is arranged at a lower portion of the support frame. The second structural frame member including an extension and a dynamometer supported operatively by the extension. The first structural frame member includes a comparator clock at a lower portion thereof. The support device is therefore operatively connected to the pivot joint assembly so as to be pivotally movable about a pivot axis relative to the support frame between first and second positions such that the support device is in operative cooperation with the distance alignment device when in the first position thereof and the dynamometer when in the second position thereof.