Fits Pre-2017 Take-A-Label dispensers where the relay was used. On the label, your model number will have a suffix less than -18. So, if you have a TAL-450, and the label on top reads something like TAL-450-15, you will likely need this photo eye. If your machine label reads TAL-250PE, 450PE, 750PE with a -18 after the model number, you will need 103P-25213.
For machines using a circuit board, use 103P-25213 photo eye.