Normally these used to measure long distances within 100km with their frequency range.
Electronic distance measuring equipment.
Mileseey laser measure 229ft m in ft digital distance meter laser measurement tool with electronic angle sensor backlit lcd pythagorean mode measuring distance area and volume.
Electronic distance measurement edm is a method of determining the length between two points using electromagnetic waves.
Edm is commonly carried out with digital instruments called theodolites.
Electronic tape measures emit a laser beam that is intended to strike an object at a distance.
The electronic distance measuring equipment is differentiated into three types as microwave instrument infra red equipment and light wave equipment.
The resulting measurement is often shown on a digital screen on the device.
The surveying equipment functions with the help of micro waves come under this category.
The light from the laser bounces back to the device and the tool uses the time it takes for the light to return to calculate the distance that the laser traveled.