This is a vintage Sinclair Cambridge calculator.

There are some issues with the battery contacts as it is very temperamental and needs perfect battery position to get it working.

This seems to be quite common with these calculators unfortunately.

Therefore, this is sold for parts as a non-working item.

However, I'm sure it can be made to work more consistently.

As you can see from the first photo, I have got it working and have tested all the buttons and functions and it does seem to work.

Thanks for looking!