Bluelab pH 7.0 Calibration Solution 500 ml"pH 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."

w/pleasant earthy

our patented blend of worm castings

EPA registration numbers:HGC704596 - 70051-106-54705HGC704597 - 70051-106-54705

Only available in black

General Hydroponics pH Test Kits make pH testing easy

The Amazing Doctor Zymes Eliminator is a revolutionary green solution that kills and eliminates soft-bodied insects

mold issues and helps extend the longevity of your fabric or plastic pot

The rainforest floor is remarkably deep with layers of exotic coconut palm humus

Gro Pro Root Master Pot 16 in (35 Liters)

repairs damaged and compacted soil

They prevent spiraling and root burrowing

Simply fill a test-tube halfway with nutrient