Many are measuring instruments - some quite ancient; some more recent. But there's other stuff as well. You will find the collection listed by category on the sidebar. Larger photos can be seen by right-clicking on the images. Where I have handbooks or other information I have included a PDF or zip version on the relevant page.
Sadly, I have had to downsize the collection in recent times, due to space limitations. However all items are still in safe hands with other collectors.
I hope you enjoy your visit to my virtual museum.
John