Calibration

Any scaling devices should be periodically calibrated in precise manner in order to keep the reliability of the datum obtained and this perception is one of a common sense in industrial fields. So, I have performed it on a camber measuring instrument with pendulum construction reading 2 minutes on 1 mm movement on the index portion adapting 1719,75mm radius construction is designed. As it is made of wood, distortion should be corrected by moving core point at adequate position. Same as rifle gun sight correction, it is precisely adjusted to duplicate 3 point on the straight line for collection. In the rainy season like now, this is very important work before starting measuring works. Any bubble enclosed convexed glass tube device for scaling vertical wheel inclination do not exceed my DIY device in precise accuracy. As primitive and childish construction as mine is, it can read 2 minutes inclination as 1mm movement on the index?