Hi JoeS.

No one brings them into South Africa, not even RS components, and its going to cost about double the entire project to ship one over so its not worth it just for an estimated 5meter distance gain and my lecturer has told me that i will get 100% if i can measure up to 10 meters with 5% accuracy because its more about implementing the theory than actual long distance measuring ability. I can always change it later, 2 lines of code and 4 resistors on the filter.