Materials such as fabric, copper foil, battery separator film, optical film, and corrugated board require accurate length control during slitting and rewinding to meet customer specifications and reduce waste. Traditional encoder wheels rely on contact measurement and can be affected by slippage, tension, and long-term accumulated errors. DALA Metrology’s DLS Series uses non-contact optical measurement to provide real-time current speed, average speed, and total length, with accuracy up to ±0.05%.