The IOND & GHL 2.1 Slave set gives you everything you need in order to start fully automating your seawater analysis and dosing procedures.
 
Fully Automatic Measurement and Control of Ca, Mg, K, Na, NO3
The ION Director® (IOND for short) uses state-of-the-art ion-selective technology to automatically and accurately measure essential water parameters – calcium, magnesium, potassium, sodium, and nitrate – with maximum comfort and affordable operating costs.