Window sampling tubes are essential tools for geotechnical site investigation and soil sampling. Our product range includes a wide variety of sizes and configurations, as well as an extensive selection of accessories such as sample liners, core catcher rings, core catcher springs, end caps and much more.

For over 20 years, Geotechnik Dunkel (GD) has been manufacturing robust window sampling tubes that have proven their reliability even in the very dense gravel deposits found in the Munich region.

Our heavy-walled sampling tubes feature heavy-metal-free, heat-treated cutting shoes and durable sampler heads made from heat-treated alloy steel.

Standard cutting shoes have the same outside diameter as the sampling tube, while reinforced cutting shoes have a slightly larger diameter, helping to reduce shaft friction in cohesive soils.

We aim to keep sampling tubes in standard lengths of 1,000 mm and 2,000 mm in stock. The special length of 1,500 mm is available to order.