The DSD-IIIA is a laser-guided pilot tube system developed for microtunneling and trenchless construction. It combines a 30X telescope with 10X optical zoom, manual precision controls, and a 5MP industrial camera to provide real-time visual guidance for pipe jacking alignment. The system supports a working distance of up to 100 m. Each stainless steel LED target undergoes a mandatory pre-shipment waterproofing test, during which it is powered on and continuously immersed in water for three days to verify that no water ingress occurs.