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
Available in 250ml & 1L Size