This set of 10 foam calorimeters offers an inexpensive improvement on coffee cup calorimetry experiments. 12 mm walls  ensure a well-insulated system that stands up to repeated use. A thick foam lid seats well to minimize the system's heat loss to its surroundings and features two small holes for use with a thermometer or data logger thermocouple. Our calorimeters also feature a flat, stable base to reduce accidents from stray elbows. Coffee cups are great for drinking coffee. But when it comes to calorimetry, cost-effective foam calorimeters are a safer and more accurate solution.