1. FAST AND ACCURATE: This three-in-one power meter is equipped with a highly sensitive chip that provides fast and accurate measurements, without requiring any warm-up time, just plug and go. 2. ADVANCED FEATURES: This multifunctional tester has a range of features, including relative power calculation, calibration, and automatic shutdown function for added convenience. 3. WIDE WAVELENGTH COVERAGE: With a wavelength range of 850 to 1650 nm, this optical power meter caters to the majority of communication engineering maintenance needs. 4. LONG LIGHT DISTANCE: This optical power meter uses a red light to detect faults from up to 15 km, making it a highly effective tool for quickly and efficiently locating faults. 5. RJ45 NETWORK TEST: In addition to the power testing function, this device also includes an RJ45 network testing function, allowing you to quickly check and correct network cabling. Specification: Item Type: Optical Fiber Power Meter Power Test Range: -70-+10DBm Red Detection Distance: 15 km Power Supply: Requires AAA Battery x 2 (Not Included) Probe Range: InGaAs Wavelength Range: 850-1650 nm Standard Wavelengths (nm): 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, 1650 Display Resolution: Linear Display: 0.1%, Logarithmic Display: 0.01dBm Working Temperature: -10 to +60 Storage Temperature: -25 to +70 Automatic Shutdown Time: 10 minutes Battery Continuous Working Time: Not less than 40 hours Material: plastic Color: Black+Red Package Contents: 1 x Optical Fiber Power Meter 1 x Lanyard Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real one. The allowed measurement error is +/- 1-3 cm.