HI-981420 GroLine Monitor

HOME » Home » Brands » Hanna Instruments » HI-981420 GroLine Monitor

The HI-981420 GroLine Monitor provides 24 hour continuous monitoring of pH, conductivity (EC or TDS), and temperature in hydroponic nutrients.

The GroLine Monitor automatically logs your results every 15 minutes over the last 30 days. Minimum, maximum, and average values are stored so you can recognise when patterns arise and help prevent future problems.

The GroLine Monitor has been developed by growers and scientists who are committed to helping you take your growing operation to the next level. A large clear LCD shows all of your essential readings so you know what your water is doing 24/7. High and low alarms flash to warn you if something needs adjusting.

Advanced algorithms and greater pH and TDS/ppm accuracy ensure operational consistency and a finer understanding of your plant’s needs. The 3-in-1 pre-amplified probe measures pH, EC/TDS, and temperature in a single, durable, polypropylene body making the GroLine Monitor easy to handle and easy to set up. A single calibration solution for pH and conductivity makes calibration fast and ensures all of your measurements are accurate resulting in better plant health and better yield.



  • 3-in-1 pre-amplified probe measures pH, EC/TDS
  • New green light technology
  • High and low alarms with LED indicator
  • Easy viewing on the large LCD with plant-safe green backlighting
  • Calibrate pH and EC with a single Quick Cal solution
  • Simultaneous display of all 3 essential readings on an easy to read large LCD with plant-safe green backlighting.
  • No need for separate probes. Supplied complete with a durable, polypropylene body 3-in-1 probe which measures pH, EC/TDS, and temperature.

inc. VAT


Real Industry Expertise

Don't be surprised to see the odd PhD knocking around our office. When you work with Vertikit you are choosing actual leaders of the field. We've got years of research experience and practical project knowledge to share.

Our Unique Approach

With our level of experience comes the ability to be really creative when it comes to product choices. Our curated product catalogue comes from the world's best suppliers of the specific technologies you need to succeed, regardless of whether they are farm-specific.


Why Choose Vertikit?

Why Choose Vertikit?

Prepared for anything. Our collective history of working with both growers and industry means that whatever the size or complexity of your operation we'll have you growing in no time.

No bias and no bull. You'll always get a straight answer from our team on your best options, regardless of manufacturer.

Vertikit source from many industries, we love to mix and match the best tech from a wide range of innovators from around the globe (yes, globe - we're scientists remember).