Question

what is absolute instrument?

Answer 1

Absolute instruments are defined as the instruments that give deflections in terms of physical constants and not measurable on a graduated scale.

1: The value of the electrical quantity to be measured are given by these instruments.2:The quantity are measured in terms of constants and from the deflection of the instruments only.
3:Tangent galvanometer, Reyleigh current balance and absolute electrometer are some of the examples of absolute instruments.

Answer 2

it means ready measure of quantity with help of graduated scale