Suitable for calibrating pH meters that have a calibration point of 4.01.
Immerse the probe of the meter into the calibration liquid and wait a few seconds; you can then calibrate and mark a point on your PH meter.
Calibration of these meters with this fluid from time to time is recommended for accurate measurements of water or nutrient solutions.
Neat 230 ml container that ensures liquid or pH 4.01 calibration solution for quite some time.
