Bluelab Inline pH Probe (Replacement Probe Guardian Monitor In-Line) Hydroponic Systems & Gardens the Add-It™ 1-Pint (

the Add-It™ 1-Pint (

25 micron bag (Purple)

application must be timed for a stage of development when larva are present in the soil

Among Mars Hydro LED grow lights

Bluelab Inline pH Probe (Replacement Probe Guardian Monitor In-Line) Hydroponic Systems & Gardens the Add-It™ 1-Pint (The Bluelab Inline pH Probe is a replacement probe for the Guardian Monitor In Line. Unfortunately, pH Probes do not last forever as they age through normal use and will eventually fail. With good care and use (keeping the probe tip wet and cleaning once a month), you will extend its life. Replace only the pH probe, not the whole meter!