﴿وَالْوَزْنُ يَوْمَئِذٍ الْحَقُّ﴾
“The weighing on that Day will be true.” (al-Aʿrāf 7:8)
The verse affirms the reality of weighing. That does not require importing every feature of an ordinary worldly scale into the balance of the Hereafter. Mīzān refers to the means by which the weight or worth of deeds is made manifest.
That something is real and that its complete modality is known are different claims. The first is affirmed through revelation; the second cannot be established by speculation alone.