पलहीने हीनद्विगुणो दण्डः ॥ कZ_०४.१.३७ ॥
palahīne hīnadviguṇo daṇḍaḥ
For a deficit of one pala (short-weight by a pala), the fine is double the amount of the deficiency (twice the shortfall).
It is a proportional deterrent: the offender loses more than the gain from cheating, making systematic short-weighting economically irrational.