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Geonics EM61 - Mark II
 The EM61, one of the newest instruments from GEONICS, is a time-domain metal detector which detects both ferrous and non-ferrous metals. A powerful transmitter generates a pulsed primary magnetic field in the earth, which induces eddy currents in nearby metallic objects. The eddy current decay produces a secondary magnetic field measured by the receiver coil.
Download PDF Spec Sheet
Features:
- Detects a single 200-litre (55 gal) drum at a depth of over 3 metres beneath the instrument, yet is relatively insensitive to nearby cultural interference, such as fences, buildings and power lines
- Response is a single, sharply defined peak, greatly facilitating quick and accurate location of the target
- Depth of the target can usually be estimated from the width of the response
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