(Rare/Early Model) ADA CO2 Control Timer

This is an early model ADA CO2 Control Timer.
It is switchable between 50Hz and 60Hz manually.

*The photos show everything included.

While the product itself should be fine, it has been stored at home for a long time. We would appreciate it if you understand that this is a used item. Please refrain from purchasing if you are sensitive or seeking perfection.

Thank you for looking.