A portable scale includes a fulcrum, a balance beam pivotally augmented on the fulcrum, the balance beam behind a load pan on one end and counting an elongated portion having a size strip extending along the elongated portion of the balance beam. The portable scale comprises a dynamic weight changeable along the elongated portion of the balance beam. The dynamic weight comprises a display unit on the stretched out portion of the balance beam for spotting the place of the dynamic weight along the measurement strip, for electrically converting the place to a weight measurement, and for showing the weight measurement. The portable scale might as well include luminescent material.