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

HM digital PRO SERIES

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Digital pH meters for hydroponic nutrient monitoring

Water Systems & Filtration

HM Digital Pro Series COM-100 Pen Style TDS/EC/Temp Meter

$74.95
Digital pH meters for hydroponic nutrient monitoring

Water Systems & Filtration

HM Digital Pro Series COM-300 Pen Style PH/TDS/Temp Meter

$159.95
Digital pH meters for hydroponic nutrient monitoring

Water Systems & Filtration

HM Digital Pro Series PH-200 Pen Style PH/Temp Meter

$99.95