Highly accurate multi-mode professional Laser Range Finder. Range finding capabilities include: Distance (straight and beeline), height, height difference and angle of projection. The LRF Professional range is designed to deliver a variety of highly accurate distance measurements with the press of a button. It has been ergonomically constructed to fit comfortably in your hand with easy access to both of the mode control buttons. Its range finding capabilities include: distance, height, height difference and angle. The LRF requires a 3V CR2 battery and will automatically turn off after 15 seconds of no operation to save power. The LRF has been manufactured with an eye safe CE approved laser and can be used in golf, construction, shooting, site survey and a many other tasks. Standard Mode Measures the straight line distance to the target you are aiming at. Beeline Mode Measures the horizontal distance to a target. Height Mode Measures how high an object or target is in relation to the range finder. Holding down the 'On' button on 'Standard' 'Beeline' or 'Height' mode will continuously scan and update distances/height/angle in real-time as you move the LRF around. Angle Mode Measures the angle of projection. (to the nearest half degree) Height Difference Mode Measures the vertical distance between two points.