The preferred coupling method depends on site conditions. Where there is a rigid surface (e.g.,
concrete or rock), adhesive or mechanical bonding can be used. Where the surface is soil, the
transducer can be embedded or fixed to an embedded mount (for example, 200 mm concrete cube or
similarly sized cylinder). If measurements are repeated at the same location, an embedded mount is
particularly justified for consistency of results.
Coupling with soil spikes in soft conditions may lead to exaggerated measurements and is not
recommended.