Which of the following is a listed type of tube sampler?

• A. Veihmeyer
• B. Auger
• C. Core sampler
• D. Gravimeter

Answer: (A)

Tube samplers are designed to capture a relatively undisturbed column of soil inside a hollow tube so the sample stays representative of depth. Veihmeyer is the name most closely associated with a standard tube sampler used in soil sampling, where a tube is inserted into the soil to retrieve a relatively intact core. This makes it a listed type of tube sampler.

An auger is a penetrating tool that twists into the soil to pull out material, but it doesn’t function as a simple tube sampler and often disturbs the soil structure. A core sampler does collect a cylindrical core, and while it is similar in purpose, it’s typically categorized separately from the traditional “tube sampler” family. A gravimeter is a device for measuring gravity, not a sampling tool, so it wouldn’t be considered a tube sampler.