HI 993310 is an instrument that has been specifically designed to address the question of correct and rapid measurement of conductivity in soil and liquids. It is supplied complete with two probes, HI 76305 with a stainless steel, conic tip for direct soil measurement, and HI 76304 for fertilizer enriched solutions.

HI 993310 measures both the soil conductivity in EC (mS/cm) as well as salt activity in grams per liter. The different scales can be selected through two keys on the front mask and two separate LED lights indicate which parameter is being tested. In addition, HI 993310 is equipped with an alarm LED that automatically turns on if the soil is too dry, or nutritive substances such as potassium or nitrogen are lacking. In the former case, de-mineralized water is to be added to the soil prior to proceeding with further tests. Direct soil measurement is facilitated by the small diameter, stainless steel, pointed HI 76305 probe. Once inserted into the ground, the user just needs to wait until the meter displays the value read by the auger-like probe.