Here are some features and specifics about the Fluke 9040:

1. Indication of Phase Rotation: It allows the user to determine the phase sequence of three-phase power systems. This is crucial for systems that require specific phase rotation for proper operation, such as motors or pumps.

2. Wide Voltage Range: It is capable of measuring phase rotation in a wide range of voltages, typically from 40V to 700V, which makes it versatile for various applications.

3. Frequency Range: The Fluke 9040 typically operates over a frequency range of about 15Hz to 400Hz.

4. Clear Display: The instrument uses clear LED indicators to show the phase orientation (clockwise or counter-clockwise) and whether each phase is live.

5. Safety: It's designed to meet safety requirements and usually comes with probes and clips to safely connect to the system being tested.

Using a phase rotation indicator like the Fluke 9040 helps ensure that equipment is installed correctly and minimizes the chance of damage due to incorrect phase rotation.