50 years ago, when I was an undergraduate, my physics department used traditional equipment in lab courses to teach us what really happens, rather than what comes up on a digital display, so we had wall-mounted mirror galvanometers with a telescope and arc scale for sensitive measurements.
A "ballistic galvanometer" application exploits the mechanical properties (inertia, damping, and natural frequency) of the coil and suspension, giving a maximum excursion proportional to the total charge through the instrument (integrating the current of a pulse).
https://en.wikipedia.org/wiki/Ballistic_galvanometerI remember using a ballistic galvanometer to measure the hysteresis curve of an iron toroid ("Rowland ring")
https://solitaryroad.com/c1049.htmlAn interesting use of such meters, probably not used in practice anywhere, is described in Vol. 18 of the famous "Radiation Laboratory" series: G E Valley & H Wallman, "Vacuum Tube Amplifiers", McGraw Hill 1948.
Section 11-16 (pp 487 - 491) describes a mirror galvanometer where the reflection hits a 920 dual photodiode driving a single high-mu 6SF5 triode that applies feedback through a resistor network to the galvanometer coil.
(In the practical example, the minimum full scale was 1 microampere, not too impressive.)
The null occurs when the optical spot equally illuminates the two photocathodes.
Errors in the simple triode amplifier are negligible for that application.