Bluelab pH Pen - Temperature Compensated Digital pH Tester Beneficial Inoculants Use it outside the grow

Use it outside the grow room for best results

The 60/40 peat-coco ratio is a proven balance for water retention plus drainage

Use it in the last 4 weeks of your flowering cycle and you'll notice the difference — growers consistently report increased stickiness

reliable replacements

light-proof plastic with reinforced channels

Bluelab pH Pen - Temperature Compensated Digital pH Tester Beneficial Inoculants Use it outside the growBluelab pH Pen Temperature Compensated Digital pH Tester Best for: growers who want a simple, accurate handheld pH check on their nutrient solution or run off. Our thoughts This is the pen most new growers should own before anything else. Getting pH right matters more than almost any other single number in growing, and this makes checking it a five second job instead of a guessing game with strips. The Bluelab pH Pen is a handheld device for measuring