The 4550041, also known as the Fluke 820-2 LED Stroboscope, is a rugged and portable tool for non-contact diagnostics of rotating machinery. It features a high-intensity 7-LED array that delivers 4,800 Lux and provides a wide flash frequency range from 30 to 300,000 FPM with a high accuracy of 0.02%. The device uses digital pulse width modulation for exceptionally sharp images, and its solid-state LED design ensures durability with a one-meter drop resistance. Common applications include inspecting belt-driven machines, roller bearings, gear teeth, and variable frequency drive motors, allowing for diagnostics without stopping the machinery.