Slide Viewer (Catherine-de-Barnes B91)

I need a working viewer for a project. My adult daughter has died and I want to retrieve all the photos I have of her on 35mm. I have bought a 2nd hand scanner to copy the slides. But it will take me months to scan and delete if I can't preview. I know I can buy one on Amazon around £25, but that's a lot of money for me if I don't need it once I have viewed all the slides going back. I offer quite a lot on Freegle, so I feel justified asking for something myself. Thank you, Sylvia