where do i put this one? where do i put this one?

Continuous Meter

Digital pH meters for hydroponic nutrient monitoring

Water Systems & Filtration

HM DIGITAL HM-100 CONTINUOUS PH/EC/TDS/TEMP MONITOR

$299.99
Hydro Master Digital pH meters for hydroponic nutrient monitoring

Water Systems & Filtration

HM Digital Hydromaster HM-500 Continuous PH/TDS/EC/Temp

$359.95
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