Description
Features at-a-glance
3 sensors combined in a single rugged probe body made for continous immersion up to 2 meters: 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. Specification Name Detail
SKU HI981421-01
pH Range 0.00 to 14.00 pH
pH Resolution 0.01 pH
pH Accuracy (@25°C/77°F) ±0.05 pH
Temperature Range 0.0 to 60.0°C / 32.0 to 140.0°F
Temperature Resolution 0.1°C / 0.1°F
Temperature Accuracy (@25°C/77°F) ±0.5°C /±1°F
EC Range 0.00 to 10.00 mS/cm
EC Resolution 0.01 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 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 (@25°C/77°F) ±2% F.S.
Temperature Compensation pH: automatic (0.0 to 60.0ºC/ 32.0 to 140.0°); EC: automatic with β set at 1.9%/°C
Calibration pH 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 Feature Automatic logging for last 30 days at 15 minute interval
Alarms High and Low with enable/disable option for all parameters
Connectivity USB Type-C
GLP Good Laboratory Practice with last 5 pH and EC calibration history
Power Supply 12VDC adapter (included)
Environment -5 to 50°C (23 to 122°F); RH max 95% non-condensing
Dimensions 125 x 185 x 38 mm (4.92 x 7.28 x 1.49”)
Weight 333g ( 11.7oz.)
Ordering Information HI981421 is supplied with HI1285-9 multiparameter probe, Quick Cal buffer solution sachets (2), HI700661 electrode cleaning solution sachets for agriculture (2), 12VDC power adapter, quality certificates and instruction manual.
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