The Geotech thin wall, stationary piston sampler, St.1, is designed for taking high quality undisturbed samples in clays, mud, silt or fine sand.
The sampler is available in two models, an international one where the samples are pressed directly into the sampling cylinder. The most common sample diameter are 50, 75 and 100 mm. In the Scandinavian model, the samples are pressed into three armoured epoxy liners inside of ID 50 mm, of a total length of 700 mm, protected by an outer steel cylinder. In both models, the sampling is done with extension rods only. No inner releasing rods are needed as the piston locking mechanism is controlled from the surface, at the sampling depth with an ingenious releasing mechanism.