Abstract: A synchronously linkable hand tool includes a base, a rotation mechanism, a first driven mechanism and a second driven mechanism. The rotation mechanism is rotatably connected to the base and includes a driving gear. The first driven mechanism is disposed on the base and includes a first driven gear and a first locking/unlocking member connected to and rotated by the first driven gear. The second driven mechanism is disposed on the base and includes a second driven gear and a second locking/unlocking member connected to and rotated by the second driven gear. The first driven gear and the second driven gear are rotated by the driving gear to synchronously rotate the first locking/unlocking member and the second locking/unlocking member. Therefore, the force is uniform during locking or unlocking to avoid damage to the workpiece.

Abstract: A spring probe includes a needle, a spring sleeve sleeved onto and fixed to the needle and having non-spring sections and at least one spring section, and an outer sleeve sleeved onto the spring sleeve and covering the at least one spring section. A part of the outer sleeve is connected with the spring sleeve. A probe device includes the spring probe, and a probe seat having dies piled on one another, including upper and lower dies. The spring probe is inserted through the dies in a way that a bottom end of the spring sleeve is abutted on the lower die.