The Essentials LAB pH test kit gives a quick comparative reading of the pH of your nutrient solution. The kit gives a quick and cost-efficient measure and is adequate for over 100 readings. It is also ideal as a back-up solution in case your pH meter should stop working. The wide spectrum test kit measures between pH4.0 and pH8.5 in increments of 0.5. Key selling points: Simple to use Cost effective An ideal back-up for your pH Meter Technical Specifications: Measures between pH4.0 and pH8.5 in increments of 0.5 Quantity 30ml℮, sufficient for over 100 tests FAQs: Q: How do I use the Essentials LAB pH test kit? A: The reagent in the Essentials LAB pH test kit changes colour in response to different pH values. Pit a small amount of your nutrient solution into the supplied plastic vial and add a few drops of the reagent and shake well. Compare the resulting colour to the chart provided and read off the estimated pH.