Bluelab pH 4.0 Calibration 500ml Pot - A true non-carcinogenic green

- A true non-carcinogenic green product

vegetables and flowers happy and healthy

It’s these chelates which give pH Perfect GMB an almost “unfair” advantage over every other 3-Part formula on the market because it drives the nutrients into your plants in the most efficient

and overall plant health

Bluelab pH 4.0 Calibration 500ml Pot - A true non-carcinogenic greenRinse probe in fresh water and place it in either pH 4. 0 or pH 10. 0 solution (use pH 10. 0 solution if you expect to measure above 7. 0 pH). Wait for reading to stabilize. Press the cal button until CAL 4 or CAL 10 is displayed CAL 4 or CAL 10 should be displayed (depending on what solution you are calibrating in).