Abstract: A device (5) and a method for determining alignment of any component in a belt drive system (1) is disclosed. The device (5) is two sets (7, 8) of lines (9, 10) placed on separate carriers (11, 12). The second set (8) is placed over the first set (7) so that some of the lines (9, 10) are coincident. The second set (8) is secured to the first set (7) at one end of the device (5). To determine any misalignment, even minute misalignment, of the belt drive system (1) the device (5) is secured to the belt surface (6) of the drive belt system (1). The belt (4) is rotated until the device (5) is fed into a pulley (2). Any misalignement of the system (1) is visually indicated by the resulting misalignment of the lines (9, 10).

Abstract: A device (10) for determining the movement or elongation of an article, particularly a belt (28), is disclosed. The device (10) is comprised of two different pitched length scales (12, 14) which when laid upon one another form a vernier scale. When the scales are laid upon one another, a small area of visible contrasting color (24) is seen. A large movement of the visible contrasting color (24) indicates the miniscule movement of either scale (12, 14), relative to the other. The device (10) disclosed may also be partially imprinted onto a belt (28) wherein minute elongation of the belt (28) is obvious.