This device is designed to provide precision and efficiency for excavation work, suitable for use with excavators, bulldozers, and similar machines. It works with all professional flat lasers with a rotating rotor. Bright LED lights clearly indicate the correct digging depth, and an optional cable connection allows adding a separate cabin display for additional visibility. The device indicates top and bottom levels with different colored LED lights, so the operator does not need to leave the cab for measurements. Depth errors are eliminated, productivity increases, extra soil handling is reduced, lowering costs, and work progresses faster. Installation is very easy. The excavator boom is cleaned, and the device is mounted using strong magnets without tools. The metal frame is water- and dustproof and withstands tough construction conditions, vibration, and shocks. Powered by a 7.2 V NiMh battery, providing at least 40 hours of operation. Operating temperature is down to -20°C, ensuring reliable performance in winter conditions. The device has a 360° reception range and four receiver windows. Window height is 25 cm, and strong magnetic mounting ensures a secure and safe attachment to the boom.