DO-13 sensor with a magnet for the Don, Akros, Vector, Slavutych combine harvester, Kharkiv region.

DO-13-(I-II) position sensor with magnet for combine harvester
Position sensor ДО-14-(I-II) with magnet for combine harvester
(//tractor-service.com)
Sensors are intended for monitoring and controlling the operation of aggregatesgrain harvesters and for solving general automation tasks.
When the end surface is excited by a magnetic field, the state of the output transistor changes to the opposite.
It is used: for the combine harvester Don, Akros, Vector, Slavutych