pH Calibration Buffer Powder to Calibrate your pH Meter

Only calibrate your meter after about 50 uses or once every 3 months if you do not use it very often. The contents will make 250 ml each. Mix and store, just use enough to calibrate (about 30 ml). The solution accuracy is ±0.01
Just add distilled water.

You will receive:
1 x pH 4.01 sachet
1 x pH 6.86 sachet

*PRICE PER SET