Blackstone BL983327-1 Mini Conductivity Controller by 10.00 mS / cm, 115/230V. Dosing Relay - closes the contact when measured value> limit.

Blackstone BL983329-1 TDS (total dissolved solids) mini controller, 0 to 999 mg / L, 115/230V. Water treatment, heating and air conditioning systems, cooling towers, surface technology, light industrial processes