求翻译：校验器由手摇泵（1），油杯（5），两个针型阀（3）（4），手揿泵（2），切断阀和两个单向阀等组成，彼此用导管连接，固定在底座（6）上，针型阀上装有联接螺母，用于联接精密压力表和被检压力表。是什么意思？

Verify by hand pump (1), the oil Cup (5), two-needle valve (3) (4), Stirrup pump (2), cut off the valve and two check valves and other components, conduit connected to each other, fixed to the base (6), the needle type valve is equipped with coupling nut, used for join precision pressure gauge and check pressure gauge.