Holey Cap SetThe Holey Cap Set is a practical, classroom ready accessory designed to support a wide range of sensor based experiments. This set of four plastic caps allows sensors such as temperature probes, pH electrodes, and oxygen sensors to be held securely in standard beakers, enabling precise and consistent data collection. Each cap is fitted with a corresponding O ring and designed to fit beakers of 100 mL, 150 mL, 250 mL, and 800 mL capacities. Whether