To build one test station:

• link chain, at least a 14' section (make sure the links fit around a 3/8" bolt)
• 8" section of link chain
• 2 3/8"x6" round head bolts threaded entire length
• 6 3/8" hex nuts
• duct tape
• 5-gallon bucket with strong handle (such as a school floor wax bucket)
• small pea stones (uniform size) or sand, enough to fill the 5-gallon bucket (sand is messier)
• ruler
• small coffee can, 16-ounce size
• scale, to weigh sand or stones

For one sample (each team needs 4 sample sets):

• 1 strip of plastic sheet, 4mm x 3" x 18" long (1 mil = 1/1000"); purchase a roll of plastic sheeting at a hardware store like Home Depot; do not use trash bags
• 5' masking tape
• 5' string

Tools for sample construction:

• rulers
• scissors
• marker