How To Use A pH Test Kit to Measure Hydroponic Nutrient Solution

How To Use A pH Test Kit to Measure Hydroponic Nutrient Solution

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There are several ways to measure the pH of your hydroponic solution, one of which is using a pH test kit. Measuring the pH of your hydroponic nutrient solution with a  pH test kit is easy to do and only takes a couple of minutes to complete.

Supplies Needed

pH Test Kit- This pH test kit is by General Hydroponics is 8 0z, so you’ll get at least 90 pH measurements out of a bottle. And it’s cheap. B01M7O2GBY View Product

Steps To Measure Hydroponic Nutrient Solution With A pH Test Kit

The first thing to do is get a sample from your hydroponic nutrient solution. pH test kits come with a little clear tube to sample in. If the tube doesn’t have a fill line, then fill it about halfway.

Next, you will add some pH testing solution to your nutrient solution sample. Typically, you only need to add 3 to 5 drops of the testing solution. After adding the ph indicator drops, place the cap on the sample tube and give it a good shake to make sure it is mixed well.

Now that you’ve got your solution and pH indicator mixed, it’s time to get a reading of the pH level. Your pH test kit should have come with a color chart to compare to your sample. With this product from general hydroponics, it comes on the bottle. Take your test tube and hold it up to the chart to compare color colors. Shades matter so make sure you’re in good light.

How to use pH test kit to measure pH of hydroponic nutrient solution

Most plants need a hydroponic nutrient solution ph range between 5.5 and 6.5, though each plant differs slightly on the exact optimal range. For a more precise desired pH range needed for the plants your growing, check out the article The Best pH Level For Your Hydroponic Garden.

If the pH of your garden is not where it should be, you will need to adjust the pH to the correct level. To do this you will need to get a pH adjuster specifically for hydroponics. Several companies offer pH adjusting products, many that are just called pH up and pH down.


While using a ph test kit is an easy, cheap way to measure the pH of your hydroponic nutrient solution, it is not the most accurate. Readings can vary depending on how many drops you use, the lighting, and perception. For a more accurate reading, I prefer to use an electronic pH meter.

What are your thoughts on measuring your hydroponic nutrients with a pH test kit? Drop them in the comments below!

2 Answers

  1. Aj
    September 26, 2019 at 4:48 pm

    What about if you use colored nutrients like GH’s hydroponic nutes, which I have. Green for veg and pink for flower. The GH ph drops cannot test my solution. I’m guessing the color throws it off. Do you know if they carry a clear nutrient solution?

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