Elevator leveling sensọ YG-1, anyị nwekwara ụdị YG-1B/YG-1A. Ụdị ntinye YG-1B, ụdị nkwụnye YG-1A. Maka nkọwa ndị ọzọ, biko nweere onwe gị ịkpọtụrụ anyị.