Topcon LS-B200W Wireless Bluetooth Machine Receiver 1053268-04The LS B200 Series of machine mounted laser sensors are affordable grade indicate systems designed to improve grading & excavating production & accuracy. Easy to use with fast setup, these depth control sensors can be mounted to your earthmoving machines in minutes. Attach any of the LS sensors to a piece of equipment, turn it on, bench in, & go to work. No more waiting for a grade checker or jumping off a machine to check your own grade. With