GroLine pH Meters & Conductivity Testers for Hydroponics

Groline waterproof combo meter. HI9814-1

Measure with confidence.

HI9814 GroLine Waterproof Combo Meter for pH, EC, TDS (ppm) - HI9814 $259.00

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.

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Upgrade to the GroLine Portable Kit

HI9814K GroLine Waterproof Portable pH/EC/TDS/Temperature Hydroponics Meter Kit $385.00

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.

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Monitor like a scientist. Grow like a professional.

GroLine Hydroponic Nutrients Monitor for pH, EC, TDS, and Temperature

24-hour continuous pH, EC/TDS, and temperature monitoring of your nutrient solution.

Our GroLine Monitor is made by growers and scientists alike who are committed to helping you take your growing operation to the next level.

For Open Reservoir For Inline

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.

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Waterproof pH Tester

Extended Life
Specialized for hydroponics, this tester goes where you go.

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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.

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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.

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Soil Conductivity Tester

Get to the heart of the matter.
The stainless steel electrode makes direct measurements quick.

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HALO^® Wireless Soil pH Meter

Next level tools for next level growers.
Take direct soil pH and temperature measurements using your smartphone or tablet.

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Green and White GroLine Waterproof Combo Tester. HI98131BG-1

Bring it all together.

HI98131 GroLine Waterproof Combo Tester for pH, EC, TDS (ppm) $209.00

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.

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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!

-Justin S
Website Review

"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!

-Brett R.
Website Review

"Love this product"

Absolutely love this product. Very accurate and easy to use. Will recommend this to everyone.

-Luc T.
Website Review

Perfect for testing directly in your soil or other growing media.

HI12943 Direct Soil and Soilless Media pH Electrode for HI9814 $209.00

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.

Need a Replacement Electrode?
Don't let a broken electrode stop you from testing. Replace with a spare and go. Quick replacements for GroLine testers and portable meters.

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Simple. Original. Smart.

HI12922

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.

Learn More

Other things to help you get started.

Calibration Solutions

Storage and Cleaning

Accessories

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.

Watch the video

Grow better with GroLine.

Measure with confidence.

No time to waste.

Higher quality measurements.

Test anywhere, anytime.

Upgrade to the GroLine Portable Kit

Complete. Start to finish.

Monitor like a scientist. Grow like a professional.

Developed to help growers test nutrients often and easily.

Simple pH Tester

Waterproof pH Tester

Conductivity & TDS (ppm) Tester

Direct soil measurements, simplified.

Direct Soil pH Electrode

Soil Conductivity Tester

HALO^® Wireless Soil pH Meter

Bring it all together.

More reasons to love GroLine.

"Best Portable Meter"

"This IS the meter for your needs"

"Love this product"

Perfect for testing directly in your soil or other growing media.

Simple. Original. Smart.

HALO^® Wireless Soil pH Meter

Other things to help you get started.

Calibration Solutions

Storage and Cleaning

Accessories

How to Prepare a Soil Slurry

Step 1: Gather your materials. You will need:

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.

pH Testing Tips

Grow better with GroLine.

Measure with confidence.

No time to waste.

Higher quality measurements.

Test anywhere, anytime.

Upgrade to the GroLine Portable Kit

Complete. Start to finish.

Monitor like a scientist. Grow like a professional.

Developed to help growers test nutrients often and easily.

Simple pH Tester

Waterproof pH Tester

Conductivity & TDS (ppm) Tester

Direct soil measurements, simplified.

Direct Soil pH Electrode

Soil Conductivity Tester

HALO® Wireless Soil pH Meter

Bring it all together.

More reasons to love GroLine.

"Best Portable Meter"

"This IS the meter for your needs"

"Love this product"

Perfect for testing directly in your soil or other growing media.

Simple. Original. Smart.

HALO® Wireless Soil pH Meter

Other things to help you get started.

Calibration Solutions

Storage and Cleaning

Accessories

How to Prepare a Soil Slurry

Step 1: Gather your materials. You will need:

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.

pH Testing Tips

HALO^® Wireless Soil pH Meter

HALO^® Wireless Soil pH Meter