Densitometry is an established technique used in most biological research laboratories. Established techniques are often assumed to be stable and therefore not subject to advancement by the application of newer technology. However, when new technology is applied to an established technique, great advances can suddenly occur. Using the latest in laser optics design, semiconductor technology and state-of-the-art software implementation, Molecular Dynamics has developed and recently introduced a new Personal Densitometer SI that has performance capabilities considered impossible only a few years ago. In addition, the entire system can be priced lower than was previously possible.