Whether you're maintaining your NU Aqua system at home or in a small office

or PPM 700 and temperature

HM Digital’s pH buffer solution comes in powder form

chloramine

Filter manufactured in the USA by Seychelle

HM Digital PSC-154 TDS/EC Controller – 4-20mA Output, Commercial Grade 800 ppm TDS calibration Whether you're maintaining your NUHM Digital PSC 154 TDS EC Controller Commercial Grade Water Quality Control with 4 20mA Output The HM Digital PSC 154 is a professional grade inline TDS EC controller engineered for high output commercial and industrial water treatment systems. It continuously monitors total dissolved solids (TDS) and electrical conductivity (EC), triggers an audible alarm when levels exceed your set point, and outputs a 4 20mA signal for direct integration with PLCs