The GX-4 Digital Laser Rangefinder is the only Rangefinder on the market that offers both line of site distances and True Golf Range with the simple ease of switching a faceplate.  When the Chrome faceplate is attached your GX-4 will preform exactly like the GX-3.  Snap on the Yellow faceplate and your rangefinder will give you advanced features such as True Golf Range and the club selector.