विंशतितण्डुलं वज्रधरणम् ॥ कZ_०२.१९.०७ ॥
viṃśatitaṇḍulaṃ vajradharaṇam
A vajra-dharaṇa (a standard weight-unit called ‘vajra-dharaṇa’) equals twenty grains of rice.
Because grains are widely available reference objects; the state can anchor official standards to simple, replicable baselines to reduce disputes and fraud.
Named units allow uniform procurement, taxation, and adjudication by ensuring everyone refers to the same certified standard.