The tester will not be connected to the energized motor, so the voltage is irrelevant. Test is done with the motor stationary - two tests at two different rotor angles, with the rotor shifted in the direction of correct rotation. This particular tester is also used to determine system phase rotation and will have a limit of 600 V for this application. I believe that this type of device will do the job for you, Brant.
Quoting from the website data :
"....Phase Rotation Tester permits the electrical contractor or industrial maintenance electrician to permanently connect and tape the terminals of the motor being installed, without having to first energize the motor by a temporary hookup from a power source, if available, to determine motor rotation. Therefore, the test set eliminates the need for temporary connections that can be time consuming, costly and quite hazardous, particularly where many large, high-voltage motors are involved.
"Also, certain types of drives should never be rotated in the wrong direction. In such cases, the temporary hookup or trial method, having a fifty-fifty chance of being wrong, can do serious harm."