Bluelab pH 4.0 Calibration Solution 500 ml (6/Cs) pumice and 15 other ingredients

pumice and 15 other ingredients

Most importantly

We’ve taken Mother Nature’s best naturally occurring elements and other components and purified and refined them into a superlative one-shot addition for satisfyingly big yields in your garden

The TrimBin Filter will nest into all other Trim Bins—sold separately—for maximum processing power

Bluelab pH 4.0 Calibration Solution 500 ml (6/Cs) pumice and 15 other ingredientspH 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.""