Leica DISTO - the original laser distance meter - Sensors developed by Leica Geosystems specifically for the P2P Technology provide rotation angles in combination with a distance measurement. Check out the graphic,
Leica 887891 Disto X4 Laser Distance Meter Outdoor P2P Package
Point to Point Technology
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Leica 887891 Disto X4 Laser Distance Meter Outdoor P2P Package
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Leica 887891 Disto X4 Laser Distance Meter Outdoor P2P Package