With a small sample, insert the strip for 2 seconds.
Remove the strip with the pad facing up.
Do not shake off excess liquid.
With the pad still facing up, wait 10 seconds and read the strip comparing the color with the colors on the container.
Discard the strip after 30 seconds.
If the concentration you want to measure is higher than 500ppm you will have to prepare the sample by diluting it.
You can put 1ml of your preparation and add 9ml of distilled water, the measurement obtained from the strip must be multiplied by 10.
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