Direct Soil EC Tester Soil Test™ - HI98331

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The Soil Test™ Direct Soil EC Tester - HI98331 is a rugged and reliable pocket-sized tester that offers quick and accurate readings. The Soil Test™ Direct Soil EC Tester - HI98331 features a stainless steel penetration probe for direct measurement of conductivity in soils. With a compact size, single button operation, and automatic calibration, Soil Test is an excellent choice for taking direct conductivity measurements in soil.


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-specific 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%/oC temperature correction coefficient
  • Stainless steel penetration electrode
  • Allows for direct measurement in soil




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 (1.41 mS/cm) 

EC/TDS Temperature Compensation 

Automatic, with coefficient (ȕ) fixed @ 2%/°C 

Temperature Range 

0.0 to 50.0°C (32.0 to 122.0ºF) 

Temperature Resolution 

0.1°C (0.1°F) 

Temperature Accuracy 

±1°C (±1.5°F) 

EC/TDS Probe 

114 mm (4.5”) stainless steel penetration (fixed) 

Automatic Shut-Off 

8 minutes, 60 minutes, or can be disabled 

Battery Type / Life 

CR2032 Li-ion (included) / approx. 100 hours of continuous use 


0 to 50°C (32 to 122°F); RH 95% max 


50 x 196 x 21 mm (2.0 x 7.7 x 0.9“) 


74 g (2.4 oz.) 

Ordering Information 

HI98331 (Soil Test) is supplied with HI73331 penetration conductivity probe, calibration screwdriver, batteries and instructions.