I am trying to measure the length and the uncertainty in length of a fiber optic cable for measuring the speed of light. So far, I have measured it the standard way: Using a standard meter scale. I understand that it is not the most accurate way to do it. So I have two questions,
1) How can I measure the length of the cable any other way?
2) If I use this method, is it possible to account for the uncertainty in the measurement? For example, taking the distribution of many length measurements to be Gaussian about a particular mean value (which I can choose to be the value I have measured using a meter rule).