Description:
A black metal ammeter with a round face and three large electrical connectors below it, marked from left to right as "LOW", "HIGH" and "+".
Its indicator consists of an arc-shaped scale with two different ranges, one marked above it going from 0 to 150, and the other below it going from 0 to 15. Over it moves a metal pointer with a stylized tip. One can see the instrument's coil near the bottom of the window, which has a large black screw above it for zero adjustment.