Gro’Chek EC/TDS and Temperature Monitor (Low Range)


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The HI993301 has a large, dual-level, backlit LCD and displays instantaneous readings of both EC/TDS and temperature, even from a distance.
  • HOLD button to freeze readings on the display
  • Waterproof
  • Backlit, graphic LCD display


Waterproof and chemically resistant, the HI993301 monitor has been designed to meet the grower’s need for equipment suited to the environments found in agricultural and hydroponics applications. At startup, the HI993301 performs a self-check to ensure proper working condition.

HI993301 has a backlit LCDs and display instantaneous readings of both EC or TDS and temperature.

HI993301 features a stability indicator that prompts the user when to take the reading. For manual recording purposes, readings can be frozen on the LCD display by pressing the HOLD button.

Calibration and temperature compensation are automatic, while the EC/TDS conversion factor and temperature coefficient (β) are user-adjustable for applicationspecific measurements.


EC Range 0 to 3999 µS/cm
EC Resolution 1 µS/cm
EC Accuracy ±2% F.S
EC Calibration automatic, one point at 1413 µS/cm or 1382 mg/L (ppm)
TDS Range 0 to 2000 mg/L (ppm)
TDS Resolution 1 mg/L (ppm)
TDS Accuracy ±2% F.S.
EC/TDS Temperature Compensation automatic with β adjustable from 0.0 to 2.4%/°C
EC to TDS Conversion Factor adjustable from 0.45 to 1.00

Meter Temperature

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)

General Meter

EC/TDS Probe HI7630 conductivity probe with internal temperature sensor, 1/2” NPT pipe thread and 2 m (6.6’) cable (fixed, included)
Power Supply 12 VDC adapter (included)
Environment 0 to 50°C (32 to 122°F); RH max 95%
Dimensions 160 x 105 x 31 mm (6.2 x 4.1 x 1.2”)
Weight 190 g (6.7 oz.) - meter only
Ordering Information HI993301-01 (EC/TDS Gro’Chek) is supplied with HI7630 conductivity probe, HI70031 1413 µS/cm calibration solution sachet, 12 VDC adapter and Instructions.