How to Choose a Resistivity Meter (Geoelectric / Geolistrik)
How the geoelectric method works, the types of instruments, and how to pick the right resistivity meter for groundwater, mineral, and geotechnical surveys.
What is the geoelectric (geolistrik) method?
The geoelectric (resistivity) method measures the resistivity of rocks and soil by injecting electric current into the ground through electrodes and measuring the resulting voltage. From the resistivity values we infer the subsurface material — for example aquifers (groundwater), bedrock, mineralized zones, or cavities.
Types of resistivity meters
Broadly there are two classes: (1) simple single-channel meters for 1D sounding (VES) — economical, fine for basic groundwater surveys; and (2) multi-channel meters for 2D/3D resistivity tomography (ERT) — far faster in the field and producing detailed subsurface sections. For professional and research work, multi-channel is the standard.
What to look for
Consider: target depth (drives transmitter power/voltage), number of channels (more = faster), Induced Polarization (IP) capability if used for mineral exploration, durability in tropical fieldwork, plus local technical support and calibration. A cheap meter with no support often becomes expensive later.
Recommended instruments
IRIS SYSCAL (Junior, Pro, Terra) is a multi-channel research-grade resistivity/IP system widely used for deep ERT and mineral exploration. OYO McOHM (EL3i, Profiler-8i) offers reliable Japanese-quality resistivity. For high-power IP (porphyry/epithermal), IRIS transmitters up to 12 kW and a distributed full-waveform system (FullWaver) are available.
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