Written on the inner circle is, "METERSEK". Written on the centre of the gauge is, "OSTMAN PATENT S". Connecting to the bar is a circular, hollow, metal frame 10 cm in diameter. Across the frame front and back is a 0.5 cm metal bar, forming a square brace. At the centre of the brace is a threaded silver bar running top to bottom and holding an eight-winged fan. Each wing is 4 cm in length.
At the centre of the front of the brace is a metal extension holding a bar and circular grooved gear wheel meshing with the threaded silver bar. The gear is attached to a silver bar running down to connect with another gear wheel inside the 11 cm hollow half-circular bar. On the back side of this bar is a brass-headed needle that, when pushed, pushes the metal needle in the gauge outward.