HI981420 GroLine Monitor for Hydroponics

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The HI981420 GroLine Monitor provides 24 hour continuous monitoring of pH, conductivity (EC or TDS), and temperature in hydroponic nutrients.

Quick to setup and simple to use, this monitor was designed with Hydroponics, Aquaponics, and Greenhouses in mind. Make your nutrient solution easy to manage with the GroLine Monitor and combined pH/EC/Temperature probe.


  • 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.
  • Data logging for 30 days. 
  • USB-C Port for easy data transfer to memory stick or PC
  • High and Low Alarms
  • Automatic Temperature Compensation
  • 3-in-1 Probe Measures pH, ED/TDS and Temperature


  • Range:
    • pH: 0.00 to 14.00
    • TDS Range: 0 to 5000ppm
    • Temperature: 32°F to 140°F
  • Resolution:
    • pH:0.1, 0.01, 0.001 pH
    • TDS Resolution: 10ppm
    • Temperature: 0.1°
  • Accuracy:
    • pH: ±0.005 pH 
    • TDS: ±2% f.s. 
    • Temperature: ±1°F
  • Power: 12VDC Adapter (included)