Read some of the topics on here about ORP sensors being useless at high CYA. Just curious if anyone has tried anything like this sensor and how useful it is?
sensorex.com
Thanks!

FCL Amperometric Free Chlorine Sensor | Sensorex
Our dependable free chlorine sensor features amperometric measurement technology. Designed for use in disinfection applications with direct 4-20mA output.

Thanks!