pH 4.01 buffer solution (20 mL)

Solution to calibrate electronic pH-meters (calibration value pH 4.01)

pH ± 0.01 @ 25 °C/77 °F

Single dose packet of 20 mL ready for use. To calibrate pocket-size pH-meters, with or without probe, directly insert the probe into the packet, making sure that the probe is covered at least 4 cm into the liquid. The content of the packet is very practical, because the solution is always "fresh" and protected from light, to the advantage of a very accurate calibration.

Measuring table based on temperature:

• 0 °C/32 °F: pH 4,01
• 5 °C/41 °F: pH 4,00
• 10 °C/50 °F: pH 4,00
• 15 °C/59 °F: pH 4,00
• 20 °C/68 °F: pH 4,00
• 25 °C/77 °F: pH 4,01
• 30 °C/86 °F: pH 4,02
• 35 °C/95 °F: pH 4,03
• 40 °C/104 °F: pH 4,04
• 45 °C/113 °F: pH 4,05