HI-70004P pH 4.01 buffer solution in 20ml sachets Price: £17.00 (Excluding: VAT at 17.5%) Quantity:
HI-77400P 5 x pH 4 and 7 buffer solution in 20ml sachets A box of 10 sachets. 5 of pH 4.01 buffer solution and 5 of pH 7.01 buffer solution. Each sachet contains 20ml of solution and can be used to calibrate any of our pocket meter range, or any pH meter with a conventional pH electrode.