HI-77400P PH COMBINATION BUFFER SOLUTION KIT 4.01 & 7.01 5 X 5 20ML SACHETS

Achieve accurate pH readings and check your meter and electrode is functioning correctly with Hanna buffer solutions. 
 Accuracy: +/- 0.01pH @ 25◦C
 Ideal for water purification plants, the food industry, aquatics, and Hydroponics
 20ml individual sachets