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Hanna Instruments Canada
Customer Support: (800) 842-6629

Soil Test™ Direct Soil EC Tester - HI98331


In stock

The HI98331 Soil Test™ is a pocket tester specifically designed to directly measure soil conductivity (EC) and temperature for quick and accurate readings. With a compact size, single button operation, and automatic calibration, Soil Test is an excellent choice for taking direct conductivity measurements in soil elimintating the need to create soil slurries. 

  • Waterproof
  • 4.5″ Stainless Steel Penetration Electrode
  • Automatic Temperature Compensation


The HI98331 features a stainless steel penetration electrode that provides the ability to take direct measurements in soil. When calibration is needed, simply submerge the electrode tip into calibration solution and and enter calibration mode for automatic 1 point calibration.

Electrolytic conductivity, abbreviated as EC, is a measurement made in which electrical charges of particles in a medium are moved under the influence of a potential difference. EC is a measure of concentration, however, it is non-specic for ion type. An ion is a charged particle present in the solution that contributes to the current flow. Ions are formed when a salt such as sodium chloride is dissolved in water to form particles having electrical charges. Sodium chloride, separates into Na+ and Cl

Electrical conductance, the ability of a substance to conduct an electrical current is the reciprocal of electrical resistance. “Conductance” and “Resistance” depend on the geometrical dimensions of the substance being measured. Conductivity and resistivity are “normalized” terms that are used to denote a bulk intrinsic property of a substance. This is the measurement a standardized EC probe on a Conductivity or resistivity meter provides. Conductivity measurements can be used to provide additional industry specific measurements; TDS, Salinity and USP compliant conductivity. Many of Hanna’s meters provide these measurements also.

Features at-a-glance:

One-point calibration

  • Automatic calibration to 1413 µS/cm conductivity standard

Automatic Temperature Compensation (ATC)

  • Samples automatically compensated for temperature variations
  • Uses a fixed 2%/℃ temperature correction coefficient

Stainless steel penetration electrode

  • Allows for direct measurement in soil

Additional information

Weight 0.14 kg
EC Accuracy

±0.30 mS/cm (2.00 to 4.00 mS/cm), ±300 µS/cm (2000 to 4000 µS/cm); ±0.05 mS/cm (0.00 to 2.00 mS/cm), ±50 µS/cm (0 to 2000 µS/cm)

EC Calibration

automatic, one-point at 1.41 mS/cm

EC Range

0 to 4000 µS/cm; 0.00 to 4.00 mS/cm (dS/m)

EC Resolution

1 µS/cm; 0.01 mS/cm (dS/m)

Temperature Accuracy


Temperature Range

0.0 to 50.0°C


SKU HI98331
Name Soil Test™ Direct Soil EC Tester – HI98331
EC Range 0 to 4000 µS/cm; 0.00 to 4.00 mS/cm (dS/m)
EC Resolution 1 µS/cm; 0.01 mS/cm (dS/m)
EC Accuracy ±50 µS/cm (0 to 2000 µS/cm), ±300 µS/cm (2000 to 4000 µS/cm); ±0.05 mS/cm (0.00 to 2.00 mS/cm), ±0.30 mS/cm (2.00 to 4.00 mS/cm)
EC Calibration automatic, one-point at 1.41 mS/cm
EC/TDS Temperature Compensation automatic, temperature coefficient (β) fixed 2% / °C
Temperature Range 0.0 to 50.0°C
Temperature Resolution 0.1°C
Temperature Accuracy ±1°C
EC/TDS Probe 114 mm (4.5 “) Stainless steel penetration
Battery Type/Life CR2032 Li-ion approximately 100 hours of continuous use
Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing
Dimensions 50 x 196 x 21 mm (2.0 x 7.7 x 0.9“)
Weight 74 g (2.4 oz.)

Ordering Info

HI98331 is supplied with a stainless steel penetration probe, batteries, and instrument quality certificate.


Soil Test™ Direct Soil EC Tester – HI98331