General method which often used in measuring lateral vibration in the ship is vibration-meter. This method has some limitation like complicated. high cost. just can measure vibration at house of bearing and cannot measure vibration at shaft which rotated. https://www.roneverhart.com/Necco-Mighty-Malts-Speckled-Malted-Milk-Eggs-Wrapped-9-Ounce-Bag/