Dip the strip into the solution you are testing for around 1-2 seconds and remove. The strip will then change colour, you should compare this colour against the pack’s colour chart in order to give a pH reading.
J-PHix® pH Indicator Strips Non Bleed pH 2.5 – 4.5, 100 Strips
Product ID: 114.2C
Brand: Johnson Test Paper -UK
5 in stock (can be backordered)