Bluelab pH 4.0 Calibration Solution Commercial Humidifier Brimming with the finest Earth-friendly

Brimming with the finest Earth-friendly natural nutrients that support rapid growth

Use them to tie your plants to stakes

This kit has what you need to get your hydroponic system started

You risk nothing at all when you try pH-Down

OxiPhos has a dual mode of action (systemic and contact) and can be applied as a foliar spray

Bluelab pH 4.0 Calibration Solution Commercial Humidifier Brimming with the finest Earth-friendlypH measuring equipment must be cleaned and calibrated regularly to ensure they are giving the user accurate readings. pH instruments are calibrated to pH 7. 0 first (buffer) then to pH 4. 0 (slope). Calibration Solution should be stored in a cool place out of direct sun and heat. They should be stored with the lids securely tightened."