The Fluke 80K-40 high voltage probe is a precision instrument designed to extend the voltage measurement range of compatible voltmeters up to 40,000 volts. It utilizes a 1000:1 voltage divider, minimizing circuit loading and optimizing measurement accuracy. This probe is suitable for measuring high voltages within energy-limited circuits, such as those found in televisions and photocopy machines. It's crucial to adhere to safety guidelines and ensure proper voltmeter compatibility for accurate and safe operation. The probe is intended for low energy applications and requires derating at higher altitudes.