Growth Technology pH Buffer Solution 4.00 / 7.00, 300ml

A pH calibration solution with a set value of pH 4.00 (Buffer 4) or pH 7.00 (Buffer 7), for calibrating pH meters, pH pens, monitors and controllers. Regular calibration keeps your readings accurate, so you adjust your nutrient solution to the pH you actually intend.

How to use

Rinse the probe with clean water before each buffer.
Calibrate in pH 7.00 first, then pH 4.00, following your meter's instructions.
Pour a little buffer into a clean container for calibration; don't return used buffer to the bottle.

Choose pH 4.00 or pH 7.00 above. Most meters need both for a two-point calibration.