If you are going to use the Snake Measurer program I'd actually recommend taking three shots then averaging out the length. Even a small difference in angle can affect the length you end up getting. The good old tried and true method of running a string along his spine from nose tip to tail tip is always the best as far as I'm concerned. You can't use the sheds as they stretch as they come off the snake and will give you a longer length than the snake really is.