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EDM                                                          Edm is a surveying instrument that utilizes an infrared or laser beam to measure the distance from the source point to a defined target point. EDMs are widely available; more sophisticated versions are usually incorporated in a total station. The introductio of electromagnetic distance measurement(EDM) has made the task of distance measuring a simple operation. These are controlled instruments that can measure long distance within a few seconds at the press of bottom.                                                                                            ...

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