Grow better with GroLine.
Meters and testers designed for hydroponic, aquaponic, and greenhouse growers to get consistently great results. Hanna GroLine products are the most accurate and easiest to use tools to help you manage your growing nutrients.Learn More
Measure with confidence.
No time to waste.
Start testing faster with Quick Cal mode to perform a single point pH and EC/TDS calibration with one solution.
Higher quality measurements.
With high resolution and high accuracy, your results are more accurate than ever.
Test anywhere, anytime.
Our GroLine Portable Meter is waterproof to withstand your grow environments.
Upgrade to the GroLine Portable Kit
Complete. Start to finish.
Upgrade to the full pH/EC/TDS (ppm) kit and get all the essentials you need to start growing more, now.
Monitor like a scientist. Grow like a professional.GroLine Hydroponic Nutrients Monitor for pH, EC, TDS, and Temperature
Our GroLine Monitor is made by growers and scientists alike who are committed to helping you take your growing operation to the next level.
Developed to help growers test nutrients often and easily.
Take accurate and reliable nutrient measurements with our portable testers that go where you go.
Simple pH Tester
Take your testing to the next level.
This simple GroLine pH tester makes upgrading from chemical test kits easy.
Waterproof pH Tester
Specialized for hydroponics, this tester goes where you go.
Conductivity & TDS (ppm) Tester
Confidence in your results.
With an adjustable TDS conversion factor, you can ensure that your results are right the first time.
Direct soil measurements, simplified.
See what your roots see.
Direct Soil pH Electrode
No matter the material.
Use with the HI9814 for pH measurements in a variety of soil and soilless media.
Soil Conductivity Tester
Get to the heart of the matter.
The stainless steel electrode makes direct measurements quick.
HALO® Wireless Soil pH Meter
Next level tools for next level growers.
Take direct soil pH and temperature measurements using your smartphone or tablet.
Bring it all together.
Specialized for hydroponics, this waterproof tester can handle any environment. It's simple, friendly design makes taking conductivity/TDS (ppm) and pH with one device easy and a pH replaceable probe extends the life of our most advanced GroLine pH/EC/TDS (ppm) tester.
More reasons to love GroLine.
Growers all over the world rely on GroLine products to ensure successful crop yields.
"Best Portable Meter"
I have been using this HI9814 daily for about a year now. I will never go back!
"This IS the meter for your needs"
Accurate testing is critical to appraising one's water to determine filtration needs. This is the one you want!! pH dead on, PPM/EC true as you can get!
"Love this product"
Absolutely love this product. Very accurate and easy to use. Will recommend this to everyone.
Perfect for testing directly in your soil or other growing media.
This electrode was created specifically for pH measurements in soil, coco, rockwool, and water. With a built-in temperature sensor and automatic temperature compensation, you can feel confident that your results are right the first time.
Simple. Original. Smart.
HALO® Wireless Soil pH Meter$225.00
Upgrade your portable pH testing experience.
Our newest HALO model lets growers, gardeners, and farmers take direct soil pH measurements using a smart phone or tablet.
Other things to help you get started.
Storage and Cleaning
How to Prepare a Soil Slurry
Not sure how to prepare a sample for pH and EC/TDS (ppm) testing? Follow these steps, or watch the video below!
Step 1: Gather your materials. You will need:
- A container cleaned with distilled or DI water
- A measuring cup
- A fresh sample of your soil
- Distilled or DI water
- A magnetic stirrer OR a stirring utensil
Step 2: Measure out equal parts of soil and distilled water, ensuring there is a large enough sample to completely submerge your electrode junction.
Step 3: Add soil to the clean container, then add the distilled water.
Step 4: Stir the sample. For best results, use a magnetic stirrer. Make sure all clumps of soil are broken up!
Step 5: Wait 15 minutes for the sample to settle before taking your measurement.
Step 6: Immerse your electrode into the sample and wait for a stable reading.
Hanna Tip: An ideal pH reading is between 5.5 and 7. If you are getting a reading far off from this, there may be a problem with your electrode. Check our pH Electrode Troubleshooting Guide for some common problems and how to fix them.