Using Local Measuring Tools Is the only Valid Tools

“Abu ‘Abd Allah (a.s.), has said, ‘It is not proper to sell with a Sa‘ (a certain measuring device) which is not in use in the city (land).’”

“Abu ‘Abd Allah (a.s.), has said, ‘It is not lawful for one to sell with a Sa‘ which is not in use in a city. A man may hire a camel man and measures with a device of his home which perhaps is smaller than the mud (a…

“I once asked abu al-Hassan (a.s.), about a people who make al-Qufzan (measuring devices) small with which they sell. He (the Imam) said, ‘They are of the people who cause losses in their belongings.’”