The ECD-4-nano is a high-resolution electrochemical dilatometer with a resolution of better than 5 nanometers. It is the perfect instrument for detecting thickness changes of the individual electrode or the full cell stack during the electrochemical cycle. The ECD-4-nano features a corrosion-resistant cell bottom and an advanced sealing concept for optimum tightness. This enables stable long-term operation and the use of a wide range of electrolytes.