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 to detect faults from up to 15km , 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.Specification: Item Type: Optical Fiber Power MeterPower test range: -D7 -70-+10DBmRed Detection Distance: 15kmPower Supply: Requires AAA battery x 2 (not included)Probe Range: InGaAsWavelength Range: 850-1650nmStandard Wavelengths (nm): 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, 1650Display Resolution: Linear display: 0.1%, logarithmic display: 0.01dBmWorking Temperature: -10 to +60Storage Temperature: -25 to +70Automatic Shutdown Time: 10 minutesBattery Continuous Working Time: Not less than 40 hoursMaterial: plasticcolour: black+redPackage Contents: 1 x Optical Fiber Power Meter1 x LanyardOnly 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.