Optical technologies offer a number of classic ways to build an encoder. I think the best choice would be https://eltra-encoder.eu/catalog/el63d devices . Eltra Encoder is widely known not only in its own country but all over the world. Manufacturing facilities are located in Italy and Slovakia.
A good quality encoder is hard to find. So is a good encoder or sensor, so popular and quality suppliers are worth their weight in gold. I think many people have heard of sourceme - https://sourceme.com which is exactly the kind of service that connects businesses with suppliers. This would be useful in your case as well.
All business owners are well aware of how important it is to have a good communication system. It speaks volumes. Thus, paying enough attention to this issue can greatly improve efficiency. I hope you have not forgotten about such a nice and very useful communication method, as SMS mailing? If you've forgotten, I advise you to remedy the situation by using SMS messages with Zorra technology - https://zorra.com/en/services/sms
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