Hydrofarm MGMP1 Active Air 2 Way pH & Moisture Meter, Green Size:2 WAY NC2: 2 way normally closed Arts craftsOUR GUARANTEE Our NC2: 2 way normally closed relay interface relay short front and COM2 Tee for connecting and branching three hoses Moisture readings register on a scale of 0 (dry) to 10 (moist) Hydrofarm MGMP1 Active Air 2 Way pH & Moisture Meter
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