One quick glance is all it takes.
A large clear LCD displays all of your essential readings so you know what your hydroponic nutrients solution is doing 24/7. High and low alarms flash warning you if something needs adjusting.
Monitor changes over time.
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 recognize when patterns arise and help prevent future problems.
One probe. Three measurements.
Our 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.
Quick Cal for less maintenance.
A single calibration solution for pH and conductivity makes calibration fast and ensures all of your measurements are accurate all of the time for better plant health and better yield.
3 sensors combined in a single rugged probe body: pH electrode with renewable cloth junction, amperometric EC/TDS sensor, and an internal temperature sensor for temperature compensated readings
IP65 rated enclosure: designed to withstand harsh grow environments
Wide pH Range: measure pH from 0.00 to 14.00 pH
Selectable EC to TDS/ppm conversion factor: choice of either a 0.5 or 0.7 conversion factor
- Automatic Temperature Compensation: all readings are compensated for variations in temperature, temperature displayed in oC or oF along with pH, EC or TDS reading
Large LCD with plant-friendly green backlighting: LCD can display all three essential hydroponic nutrient measurements at one time, a 3-second cycle of single measurements, or a real-time graph screen with options for measurement selection and log recall
Data logging for 30 days: logs every 15 minutes for last 30 days, stores min, max, and average values
Data transfer: USB-C port for easy data transfer to memory stick or PC
- High and low alarms: warns when your nutrient solution is out of desired range by flashing display and message
- Ambient light sensor: for automatic LCD dimming
pH Range 0.00 to 14.00 pH; 0.0 to 14.0 pH pH Resolution 0.01 pH; 0.1 pH pH Accuracy ±0.05 pH; ± 0.1 pH pH Calibration 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 pH Temperature Compensation automatic (0.0 to 60.0ºC/ 32.0 to 140.0°) EC Range 0.00 to 10.00 mS/cm EC Resolution 0.01 mS/cm EC Accuracy ±0.1mS/cm (0.00 to 5.00mS/cm); ±0.2mS/cm (5.00 to 10.00mS/cm) EC Calibration one-point at 1.41 mS/cm or 5.00 mS/cm using auto standard recognition; one-point calibration using quick calibration solution TDS Range 0 to 5000 ppm (TDS conversion factor 0.5 (500 CF)); 0 to 7000 ppm (TDS conversion factor 0.7 (700 CF)) TDS Resolution 10 ppm TDS Accuracy ±2% f.s. EC/TDS Temperature Compensation automatic Temperature Correction Coefficient β set at 1.9%/°C EC to TDS Conversion Factor TDS conversion factor 0.5 (500 CF); TDS conversion factor 0.7 (700 CF) Temperature Range 0.0 to 60.0°C / 32.0 to 140.0°F Temperature Resolution 0.1°C / 0.1°F Temperature Accuracy ±0.5°C /±1°F Alarm Relay Set Point high and low with enable/disable option for all parameters Multi-parameter Probe HI1285-8 pH/EC/TDS/temperature polypropylene body, pre-amplified multiparameter probe with internal temperature sensor DIN connector and 2 m (6.6’) cable Logging Type automatic logging for last 30 days at 15 minute interval Connectivity USB Type-C for flash drive or compatible device GLP last 5 pH and EC calibrations Display 128 x 64 pixel B/W LCD with green backlight Power Supply 12VDC adapter (included) Environment -5 to 50°C (23 to 122°F); RH max 95% non-condensing IP Rating IP65 Dimensions 125 x 185 x 38 mm (4.92 x 7.28 x 1.49”) Weight 333g ( 11.7oz.) Ordering Information HI981420 is supplied with: HI1285-8 multi-parameter probe, HI50036-0 Quick Cal buffer solution sachet (2), HI700661P electrode cleaning solution sachets for agriculture (2), 12VDC adapter, calibration certificates for both meter and probe, and instruction manual.