Product description:
Kelilong Water's pH Controllers are packaged in a 1/4 
DIN panel mount controller box with dual SPDT Hi/Lo 
Relays, manual set points and calibration potentiometers 
Set into the front of the pH controller panel.  the pH 
Controllers feature an isolated 4-20 mA current output.  
the pH Controllers require a Pt-100 ATC probe or a 
Simulation resistor for temperature compensation.

KL-018 Industrial on-line PH Controller   Model KL-018 Measuring range 0.00~14.00PH Accuracy ±0.02PH Resolution 0.01PH Output current 4-20mA Automatic temperature compensation 0~100℃ Warning accuracy ±0.02PH Environment Temperature:0~50℃ Humidity<95℅ Display 4-digital LED Input Impedance 1012Ω Power Supply 220V±10℅ 50Hz±2℅ Dimensions 96mm96mm160mm Weight 950g