Potions and Poisons B

Question: Can you clarify the type of "...any needed probes" that may or may not be used and their purposes as noted under the "Event Supervisor will provide..."? (section: 2 / part:  / paragraph: d / sub-paragraph:  / line: 2)

Response: For example, the Event Supervisor may ask students to measure the pH of a solution to a higher precision than pH paper is able to determine. In that case, the Event Supervisor will provide the necessary probe(s) needed to get the additional precision.