This pack contains 100 pH strips - each one has a much more precise scale for more accurate measurement.
1. Dip Strip into batch for 0.5 second
2. Shake off excess liquid
2. Compare and match all four colour squares at pH 7 on chart (if you want neutral pH)
3. Adjust formula with Citric acid or other agent
4. Retest to check
5. Note down exact change to formula to future batches