Which soil sampling method is appropriate depends on why you are sampling the soil. The main difference between methods is the degree of soil disturbance during sampling. For some purposes (eg chemical analysis) mixed or broken up soil is required. For physical measurements, (strength, water holding) the sampler should remove a portion of soil without disturbance. Soil Water Solutions sell three types of samplers and an ‘installer’ which is not intended to take a sample but to make a hole into which an instrument will be installed.
1. 50mm diameter soil auger- to obtain a disturbed soil sample from depths up to 2m (most commonly 0-1m). (We can supply larger diameter augers but these can be obtained more cheaply from most hardware stores)
2. Tanner Sampler - to obtain undisturbed soil samples from surface, or near surface soils or the walls of a pit.
3. Tube sampler tips - to make tube samplers - these are usually used with a jack hammer or as an accessory for truck mounted hydraulic soil samplers. Samples are disturbed - but not as badly as with auger sampling
4. Instrument installers - these are ‘micro- augers’, not designed to take a soil sample (though they will), but are intended to make a small hole to install instruments.