Each group needs:

• 3-5 pre-treated microscope slides
• beaker
• pipette
• magnifying glass
• stopwatch
• hot plate
• tongs
• lab gloves
• eye protection
• Investigating Contact Angle Worksheet, one per student

To share with the entire class:

• 2-4 types of water-repellent products with which to pre-treat glass slides for each team, such as Rain-X® Glass Treatment ($9), Rain-X® Anti-Fog™ ($8), Rain-X® 2-in-1 Glass Cleaner and Rain Repellent ($7), and G-Glass® Totally Green Hydrophobic Rain Repellent ($7)
• marker or wax pencil to label glass slides
• (optional) paper towels, sponge, mop, in case of spills