3,457. Those Who Sell by Approximation

Hilchos Maaser 11:3

A large quantity is half a seah in dry measure (about 1.25 gallons) or a dinar’s worth of a liquid in liquid measure.

Hilchos Maaser 11:4

Even if someone sells baskets of olives and grapes or containers of vegetables by approximating their volumes, he may not sell them as demai.