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The point of range finder was found in our life--when doing home decoration ,my mother measure the wall one by ong, I recorded the numericals, I found the process very inconvenient. Existing range finder can only measure the distance between itself and the measured object,single way, I hope there's a product that will allow me to mesaure every two pionts, which can be seen, whereever I stand. So we two thinked a lot on this issue for a long time.We‘ve thought that can the laser projector home circuit diagram, at last we consider that we want to do a simple and useful,inexpensive products that can help others,not a expensive and useful one wit