Just knife or shoot the boards to destroy them, but there will be electric anomalies behind the doorway. Once you get there, you must travel through and find a doorway boarded up with two boards across it. The second set of calibration tools are located at the Old Service Center. When you get to a room with stairs going to a basement, go down the stairs and on a table will be the set of tools.

There is a maze of doors as you enter so try to get through as best you can.

Inside there will be a large number of Hamsters, so carrying a shotgun would be recomended. When you enter, go behind the main desk and open the door. The first set of calibration tools in Pripyat will be located at the Department Store.