1FAST AND ACCURATE: This three in one power meter is equipped with a highly sensitive chip that delivers quick and precise measurements, without requiring any preheating time, simply plug and go. 2ADVANCED FEATURES: This multifunctional tester boasts a range of features, including relative power calculation, calibration, and automatic shutdown functionality for added convenience. 3WIDE WAVELENGTH COVERAGE: With a wavelength range of 850 to 1650nm, this optical power tester caters to the majority of communication engineering maintenance needs. 4LONG LIGHT DISTANCE: This optical power meter uses a red light source to detect faults from up to 15km away, making it a highly effective tool for locating faults quickly and efficiently. 5RJ45 NETWORK TEST: In addition to power testing function, this device also includes RJ45 network testing capability, allowing you to quickly check and correct network cable wiring.