तुलायाः कर्षहीनातिरिक्तमदोषः ॥ कZ_०४.२.०६ ॥
tulāyāḥ karṣahīnātiriktam adoṣaḥ
For the weighing-scale (tulā), a deviation up to one karṣa—whether short or excess—is not an offence.
Different instruments have different error profiles; the state calibrates tolerance to what is practically measurable and enforceable for each device.