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The HI981420 GroLine Monitor for Hydroponic Nutrients provides around-the-clock, continuous monitoring of pH, conductivity (EC & TDS), and temperature in hydroponic nutrient solutions. Quick to setup, 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.

  • Get 24/7 pH&EC measurements for consistent yields every time.
  • Good Laboratory Practice (GLP) feature for professional accuracy.
  • Calibrate pH and EC with a single Quick Cal solution.
pH Range0.00 to 14.00 pH
pH Resolution0.01 pH
pH Accuracy (@25°C/77°F)±0.05 pH
Temperature Range0.0 to 60.0°C / 32.0 to 140.0°F
Temperature Resolution0.1°C / 0.1°F
Temperature Accuracy (@25°C/77°F)±0.5°C /±1°F
EC Range0.00 to 10.00 mS/cm
EC Resolution0.01 mS/cm
EC Accuracy (@25°C/77°F)±0.1mS/cm (0.00 to 5.00mS/cm); ±0.2mS/cm (5.00 to 10.00mS/cm)
TDS Range0 to 5000 ppm (TDS conversion factor 0.5 (500 CF)); 0 to 7000 ppm (TDS conversion factor 0.7 (700 CF))
TDS Resolution10 ppm
TDS Accuracy (@25°C/77°F)±2% F.S.
Temperature CompensationpH: automatic (0.0 to 60.0ºC/ 32.0 to 140.0°); EC: automatic with β set at 1.9%/°C
CalibrationpH calibration at one or two-point calibration (using pH 4.01,7.01, 10.01 buffers) using auto buffer recognition; one-point calibration using quick calibration solution; EC calibration at one-point at 1.41 mS/cm or 5.00 mS/cm using auto standard recognition; one-point calibration using quick calibration solution
Log FeatureAutomatic logging for last 30 days at 15 minute interval
AlarmsHigh and Low with enable/disable option for all parameters
ConnectivityUSB Type-C
GLPGood Laboratory Practice with last 5 pH and EC calibration history
Power Supply12VDC adapter (included)
Environment-5 to 50°C (23 to 122°F); RH max 95% non-condensing
Dimensions125 x 185 x 38 mm (4.92 x 7.28 x 1.49”)
Weight333g ( 11.7oz.)
Ordering InformationHI981420 is supplied with: HI1285-8 multiparameter probe, HI50036-0 Quick Cal buffer solution sachet (2), HI700661P Electrode cleaning solution sachets for agriculture (2), 12VDC adapter, instruction manual, Monitor Quality Certificate, & Probe Quality Certificate.



Model Item Quantity Unit Price Line Total
Default Title - Hydroponics Monitor
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