The HLPM provided by LBTEK is a compact, lightweight, standalone power meter that can easily fit into a pocket or toolbox. This instrument is microprocessor-controlled and features wavelength correction, auto-ranging adjustment (displaying µW or mW), power overload warning, and an auto-off function. When measuring power >10 mW, a higher measurement range of up to 1 W can be achieved by manually sliding the attenuator to the sensor side. The built-in optical attenuator protects the embedded silicon photodiode from saturation-induced damage. The product comes with a battery, a built-in pocket clip, and a storage case. Note: The built-in battery is not replaceable, and its typical lifespan is approximately 180,000 measurement cycles.