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Managing pH is the key to a successful indoor grow. This GHE manual colorimetric reagent tester lets you measure the pH of your water or nutrient solution between 4.0 and 8.5 in seconds, with no electronics at all. An affordable, reliable solution trusted by beginners and seasoned growers alike.

| Measuring range | pH 4.0 to 8.5 |
|---|---|
| Number of tests | ~200 readings |
| Method | Colorimetric reagent (drops) |
| Compatibility | Soil & hydroponics |
Perfect for soil and hydroponics, this tester supports every stage of your grow, from cuttings to flowering.
Add a few drops of reagent to your sample and match the resulting colour to the supplied chart to read pH instantly.
No batteries, no calibration: an affordable, robust solution that is always ready to use.
Take a sample of your solution, add a few drops of reagent, then compare the resulting colour with the chart to read the pH.
How many tests can I run with this kit?The bottle provides roughly 200 readings, enough to monitor your crops' pH for many months.
A well-managed pH means optimal nutrient uptake and healthy, thriving plants.