FGSS900-21
SICK FGSS900-21 Light Curtain Sender 1 012 608 5W 30MM 24V
What I like about this unbranded piece is how straightforward and reliable it feels.
Sick FGSS900-21 Light Curtain Transmitter 1 012 608
The 7000-1GAL model has a wide neck that fits most funnels without spilling.