Crane and trolley positioning is critical for safe, efficient material handling. A reliable model combines sensors, controllers, and software to locate the bridge, trolley, hoist, and load in real time. Common positioning models include laser distance measurement, absolute encoders, barcode/RFID rail tracking, and GPS/RTK for outdoor cranes. Each model offers different accuracy, speed, and installation needs. Key specifications should be reviewed before selection. Accuracy defines how close the reported position is to the true position, often within 1 mm to 10 mm for laser systems. Repeatability shows consistency, which matters for automated storage and retrieval. Measuring range must cover the full travel distance without blind zones. Communication interfaces, such as Ethernet/IP, PROFINET, Modbus TCP, or CANopen, must match the crane control system. Update rate affects dynamic control; 10 to 100 Hz is typical. Environmental protection, including IP65/IP67, vibration resistance, and temperature range, ensures reliable operation in dust and humidity. For trolley positioning, anti-sway control and skew detection improve load stability. For bridge cranes, dual-axis positioning combines long-travel and cross-travel data. Specifications include voltage, output type, cable length, safety certification. When choosing a model, match accuracy to the task: manual cranes need less precision; automated cranes require high repeatability. Calibration, cleaning, and alignment checks extend service life.