Final answer:
The indicators a fluoroscopic user must have are the x-ray tube current meter, the x-ray tube potential meter, and an x-ray 'beam on' timer to monitor and control radiation dose rates.
Step-by-step explanation:
The question pertains to the equipment that must be readily available to a fluoroscopic user to indicate dose rate during a procedure. The indicators that must be readily available are:
- x-ray tube current meter
- x-ray tube potential meter
- x-ray "beam on" timer
These indicators help in monitoring and controlling the dose rate during fluoroscopic examinations, which is crucial for patient safety to minimize radiation exposure. Dosimetry equipment such as dosimeters, Geiger counters, and scintillators measure radiation exposure but are not necessarily part of the operating controls of a fluoroscopy machine.