HM-510 Grain Size Chart is widely used by field technicians and geologists as a reference for visual classification of soil samples. The handy, economical and pocket-sized tool has recessed die-cut cavities filled with precision sieved sedimentary particles permanently mounted to the chart. Particles are classified according to the Wentworth Grade Scale. Identifies particles in six variations ranging from silt to very coarse sand, and also designates scales of sphericity and roundness.
- Sturdy and convenient pocket-size chart
- Contains information on both sides of card