howto locate plus/minus on tweeter

To check the fase on a woofer i just connect a 1.5v batter to the terminal and check wich way the element moves. if the element moves in then the plus on battery is connected to the woofer's minus terminal. If the element moves out then the plus on the battery is conncted to the woofer's plus.

How do i check the fase on a tweeter?

There is nothing written on this tweeter and i want the same fase connected as the woofer.