My first spectrophotometer

Have you seen a spectrophotometer with analog dosplay?

I was using this Beckmann gray photometer during my trainee at hospital laboratory. This instrument was vintage already, but still in routine use.

Like this it goes:

1. Warm up
2. Adjust zero
3. Select wavelenght
4. Blank adjust
5. Read standard and specimen and avoid parallax error
6. Clean up

Manual and fun. Golden memories

Image credits: Trivox tripod