Sensor for Barograph

Hi huys,
I need some kind of sensor who can track this pin on barograph (check the attachment) and transform me all data in digital output.
I was thinking about range sensor from above and track distance of the pin and measuring on that way. Do you have some better ideas? Thank you.

Laser dot reflecting off pointer, into linear CCD?

Woow linear CCD sensor is exactly what I need. Thank you so much!

Why not use a barometric pressure sensor to collect the data, and admire the barograph for its beauty?

Wonder if anyone still makes instruments like that? Would love to have one, if only to look at. :slight_smile:

simple webcam + RPi.