Abstract: A pH indicator module is configured to attach on a proximal end to a suction mechanism and on a distal end to a proximal end of an aspiration tube. The pH indicator module comprises a barrel connector configured to attach to an aspiration tube, the barrel connector forming an inner passageway, the passageway being located in a direct flow path of the aspirated fluid when the pH indicator module is used. The barrel connector is configured to receive a pH indicator material placed in the passageway, the pH indicator material being configured to come into contact with a direct flow of the aspirated fluid drawn into the passageway to determine a pH value of the aspirated fluid. The pH indicator module also comprises a cap portion configured to attach on a proximal cap end to the suction mechanism and to attach on a distal cap end to the barrel connector.