Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) says that the Messenger of Allah (peace and blessings be upon him) said: "The scale is the scale of the people of Makkah, and the measure is the (standard) measure of the people of Madinah."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7717