After dipping the strip, use your smartphone or tablet camera to take a photo of the strip within 10 seconds. Align the strip with the bottle to match the colour/ppm value. Ensure the image is focused on the sample, then confirm the result.
For a detailed, step-by-step guide on how to use the Express Inhibitor Test, please refer to this guide.
For a detailed, step-by-step guide on how to use the Instant System Test, please refer to this guide.
