Use VitaLink ESSENTIALS Buffer solution to calibrate pH meters. This pH 4 Buffer solution gives an accurate representation of the pH scale at pH4 to measure against. Use VitaLink ESSENTIALS Buffer 7 for a 2 point calibration scale. This will give an accurate range of measurement that hydroponic nutrients work within.
Perfect for use with the ESSENTIALS pH meter
Perfect for use with the ESSENTIALS pH meter