HM Digital Hydromaster Portabl HM-200: Portable pH/EC/TDS/Temp Monitor The HM-200 is a versatile portable pH/EC/TDS/Temp monitor ideal for all water quality testing, hydroponics, water purification applications, wastewater regulation, aquaculture, colloidal silver, labs &... $197.64 $335.44
HM Digital Hydromaster 100 - C HM-100: Continuous pH/EC/TDS/Temp Monitor The HM-100 is a pH/EC/TDS/Temp monitor ideal for all water quality testing, hydroponics, water purification applications, wastewater regulation, aquaculture, colloidal silver, labs & scientific testing,... $206.18 $353.74