Thank you and it was either on this site or something I ran across in my research before getting my BP's it is a website you upload a picture with an item in it of defined length such as the wood block in their pictures and then you mark the measured object and input its length then you begin plotting dots along the snake to measure it. It is quite time consuming to get a pretty accurate measurement and you have to use overhead shots for best measurements. I generally take the even more time consuming route and measuring 3 separate pictures all taken on the same day and then average the lengths it gives and thus far it has been pretty accurate.
Here is the website http://serpwidgets.com/main/measure









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