Each group needs:

• 4 PVC elbow joints (90°, ½-inch [1.27 cm] diameter)
• 2 PVC T-joints (¾ x ¾ x ½-inch [1.9 x 1.9 x 1.27 cm] diameter)
• 2 PVC T-joints (½ x ½ x ½-inch [1.27 cm] diameter)
• 9 PVC pipes (2.5-, 2.5-, 4-, 4-, 6-, 6-, 6-, 8-and 8-inches [6.35-cm, 10.16-cm, 15.24-cm, 20.32-cm] long; all ½-inch [1.27 cm] diameter)
• 1 PVC cross joint (all ½-inch [1.27 cm] diameters)
• string, 24 inches (61 cm) (such as kite string)
• 1 extension spring, 3-inch (7.6-cm) size
• 1 large paperclip
• plastic drinking straw or coffee stirrer, cut to 1-inch (2.5 cm) length
• cardstock, cut to 8.5 x 1.5-inch (21.6 cm x 3.8 cm) size
• Hand Dynamometer Assembly Instructions
• Grip Strength Data Worksheet, one per person
• pen or pencil
• calculator

Note: PVC and springs are readily available at hardware stores.

For the entire class to share:

• PVC gluing cement
• calibration weight (a 15–20 lb [6-9 kg] dumbbell is ideal)
• hand saws
• pencils
• rulers
• masking tape
• scissors