Final answer:
A multimeter is the appropriate tool for testing the pinout of a twisted-pair cable, as it can check for continuity and correct connections.
Step-by-step explanation:
A multimeter is a measuring instrument that can measure multiple electrical properties. A typical multimeter can measure voltage, resistance, and current, in which case can be used as a voltmeter, ammeter, and ohmmeter. Some feature the measurement of additional properties such as temperature and capacitance.
To test a twisted-pair cable's pinout, the correct tool to use would be a multimeter. Geiger counters, scintillators, and dosimeters are used for different purposes, mainly related to the measurement of radiation. Specifically, a multimeter can check for continuity and ensure that each wire within the twisted-pair cable is correctly connected to the corresponding pin on the connector.