The thesis implements a handheld measuring device for measuring roll diameter. The device is built to international paper industry consultant company. The device creates a measurement that gives a preliminary assessment about the shape of the roll. Measurement is performed by moving the measurement device parallel to the rolls height. Therefore, measurements done in the thesis only measure diameter variations perpendicular to the height of the cylinder-shaped roll. The thesis device has two rods. Movable mount is attached to each rod so that the device can be adjusted for different roll sizes. attached to the other rod is a dial indicator. When the contact point of the dial indicator is moved the distance is passed to the device in a micr...