This is the 14880th most frequent Russian word.
пограничного
"Пограничного" translates to "border" or "boundary-related" in English.
Here, 'пограничного' describes 'состояния', referring to a state near transition or limit.
Мы исследуем пограничного состояния материала.
We are investigating the borderline state of the material.
Here, 'пограничного' modifies 'уровня', indicating a level at the border or limit.
Там же стоит пограничного уровня контроль качества.
A border-level quality control is implemented there.
In this context, 'пограничного' specifies 'пункта', implying a checkpoint related to a border.