The first item is the Duo Lux Flash unit. The item is in very good condition physically, but it has not been tested. Its supplied with its original brown case. It does take a battery but I have no idea what size. Its pre 1950 as its made in Germany (before the split). This is flagged as a design classic as appearing in the Museum of Design in Plastics. 

The second is the Agfa Tully Flash unit with its original case. The item has not been tested as I dont have any appropriate flash bulbs.

The third item is Leningrad 4 Exposure meter. Unfortunately I know nothing about this model. The Cells and appropriate readings appear to be working fine. The case is the original which is a crocodile effect with Russian writing.

If you have any questions about any of these items please send me a message.