Check the listing for details. Trimble Earthworks TD520-LW Machine Contol Display Unit. Condition: Used. Listed at 4500.00 USD. This is a newer unit from a Cat dozer that was on rent. The display screen got cracked on the edge as seen in photo. Crack is not within the screen viewing area. $4,500.00 OBO The Trimble Earthworks TD520-LW Machine Control Display Unit is a specialized device designed for accurately controlling and guiding machines in agricultural and forestry settings. Manufactured by Trimble, a reputable brand in GPS and guidance equipment, this display unit provides accurate and efficient control for various machines, helping to streamline operations and improve productivity in the field. With its user-friendly interface and reliable performance, the Trimble Earthworks TD520-LW is a valuable tool for businesses in the agriculture and forestry industries looking to enhance their operations.