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

Teamed with our Bluelab ppm or EC Pen

This trellis netting helps to increase yields by providing plants with greater exposure to light

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).