In spite of its name, the Clay Auger will sample the widest variety of soils. Good for most soils between dry sand and wet mud. Fits all JMC Quick Connect Professional Auger components.
Threaded Guide Rod fits manual sliding hammer for both the JMC Environmentalist's Sub-Soil Probe (0.8 inch diameter sampler) and the JMC Environmentalist's Sub-Soil Probe Plus (1.2 inch diameter sampler).