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Replaceable 122 mm 4.5″ penetration probe Automatic temperature compensation Lightweight and portable Directly measure soil conductivity and temperature Measures 6-25/64length by 1-19/32width by 1height This EC Pen will tell you how much nutrient is in your soil. Great for letting you know when your plants are under or overfed. Long probe is inserted into soil and EC is digitally displayed. The HI 98331 Soil TestTM is a special pocket tester designed to directly measure soil conductivity and temperature. With an incorporated sensor in the penetration probe readings are automatically temperature compensated. Conductivity range can be calibrated at one point and is designed to be calibrated in liquid.