Here's an overview of the Fluke 437 Series II 400 Hz Power Quality Monitor and Energy Analyzer:

1. 400 Hz Measurement: As the name suggests, this device is particularly designed to measure systems operating at 400 Hz, which is different from the standard 50/60 Hz systems commonly found in most commercial and residential environments.

2. Comprehensive Analysis: It offers advanced power quality analysis and logging, helping to pinpoint issues, and understanding the root causes of power quality problems.

3. Energy Loss Calculator: This feature allows users to quantify the costs associated with energy loss due to power quality issues.

4. Waveform Capture: The device can capture rapid voltage changes and provide waveforms for detailed analysis.

5. High-resolution Recording: It can monitor system performance by logging more than 20 separate power quality parameters continuously.

6. Unified Power Measurement: This capability quantifies how efficiently power is being converted and delivered to connected loads.

7. AutoTrend: Automatically captures variations in voltage, current, frequency, and power harmonics to help monitor system performance over time.

8. Safety Ratings: Like most Fluke devices, it adheres to essential safety standards.

9. Connectivity and Reporting: With the accompanying software, the collected data can be easily transferred, and detailed reports can be generated.

10. Portable Design: Designed with portability in mind, it's suitable for both field and lab work.

11. Battery Life: It typically offers a reasonable battery life suitable for extended field measurements.

12. Easy Interface: A user-friendly interface helps in navigating the device and setting up measurements efficiently.

The Fluke 437 Series II 400 Hz Power Quality Monitor and Energy Analyzer is a valuable tool for professionals in industries where 400 Hz systems are prevalent.