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Groline Hydroponic Waterproof Portable pH/EC/TDS/Temperature Meter - HI9814

The HI9814 is a slim, lightweight, and waterproof portable meter that measures pH, conductivity (EC), total dissolved solids (TDS) and temperature with a single amplified probe. The meter operation is simplified with two buttons. One is used for on/off and for calibration while the other is used to switch between the measurement modes. The HI9814 has advanced features including an selectable EC to TDS conversion factor (0.5 - 500 ppm and 0.7 - 700 ppm).


Product Description


pH Range 0.00 to 14.00 pH
pH Resolution 0.01 pH
pH Accuracy ±0.01 pH
pH Calibration automatic, at one or two points using standard buffers (pH 4.01, 7.01,10.01); one point calibration using quick calibration solution
Conductivity Range 0.00 to 6.00 mS/cm
Conductivity Resolution 0.01 mS/cm
Conductivity Accuracy ±2% F.S.
TDS Range 0 to 3000 ppm (500 CF); 0 to 3999 ppm (700 CF)
TDS Resolution 10 ppm (mg/L)
TDS Accuracy ±2% F.S.
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
Temperature Compensation pH: automatic; EC/TDS: automatic with β set at 1.9%/°C
EC/TDS Calibration automatic, one-point at 1.41 mS/cm or 5.00 mS/cm; one point calibration using quick calibration solution
TDS Conversion Factor 0.5 (500 ppm) or 0.7 (700 ppm)
Electrode/Probe HI1285-7 polypropylene body, pre-amplified multiparameter probe with internal temperature sensor, DIN connector and 1m cable
Battery Type/Life 1.5V (3) AAA / approximately 500 hours of continuous use; auto-off after 8 minutes of non-use
Auto-off after 8 minutes, 60 minutes, disabled
Environment -5 to 50°C (23 to 122°F); RH max 100%
Dimensions 152 x 58 x 30 mm (6.0 x 2.3 x 1.2”)
Weight 205 g (7.2 oz.)


The HI9814 portable meter features a large multi level  LCD which displays both pH, EC or TDS and temperature readings simultaneously. The pH readings are displayed with a 0.01 resolution and an accuracy of +/-0.05 pH while the EC and TDS readings are displayed with a 0.01 mS/cm and 10 ppm (mg/L) resolution and 2% full scale accuracy. The EC range of the HI9814 is from 0.01 to 6.00 mS/cm and TDS is from 0 to 3000 ppm using the 0.5 conversion factor. The EC to TDS conversion factor is selectable 0.5 (500) and 0.7 (700 ppm). A built in temperature sensor allows for automatic temperature compensated measurements of EC and TDS.  The HI9814 has many advanced features that are found in more expensive portable instrumentation including automatic calibration, buffer/standard recognition and temperature compensation. The LCD screen has indicators for calibration status and stability, as well as on-screen tutorial messages. The battery percent level is displayed at start up alerting the user to the remaining battery power that is available.  The supplied HI1285-7 is a  polypropylene body, amplified pH electrode with a built-in EC/TDS and temperature sensors. The amplifier for the pH electrode prevents interference from humidity and sources of electrical noise include circulating pumps, motors and ballasts for grow lights. The HI9814 is a versatile meter designed for hydroponics, greenhouse and agriculture applications.

Ordering Information

HI9814 is supplied with HI1285-7 multiparameter probe, HI50036-0 Quick Cal buffer solution sachet (3), HI700661 pH electrode cleaning solution sachet for agriculture (3), 1.5 AAA batteries (3), and instructions.