1. FAST 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. 2. ADVANCED FEATURES: This multifunctional tester boasts a range of features, including relative power calculation, calibration, and automatic shutdown functionality for added convenience. 3. WIDE WAVELENGTH COVERAGE: With a wavelength range of 850 to 1650nm, this optical power tester caters to the majority of communication engineering maintenance needs. 4. LONG 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. 5. RJ45 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.<br><br>Specification: Item Type: Optical Fiber Power Meter Power test range: -D7 -70-+10DBm Red Light Source Detection Distance: 15km Power Supply: Requires AAA battery x 2 (not included) Probe Range: InGaAs Wavelength Range: 850-1650nm 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 colour: black+red<br><br>Package Contents: 1 x Optical Fiber Power Meter 1 x Lanyard<br><br>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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.