Question

what is the most convenient device to measure mass​

Answer 1

Answer:

Balances and Scales

For most everyday objects, scientists use a balance to obtain an object's mass. 

Answer 2

Answer:

a balance

Explanation:

A balance can measure weight and mass. Because the measurement of the balance weights changes by the same factor as the object being measured, a balance is able to accurately provide the mass of an object regardless of the specific gravity of the environment.