30KM Optical Fiber Power Meter High Accuracy Multifunctional Optical Power Tester VFL with LED Light ‑70 to +10dBm Item Type: Optical Fiber Power Meter Material: ABS Wavelength Range: 800 to 1700 Detector Type: InGaAs Measurement Range (dBm): -70 to +10 Uncertainty: ± 5% Standard Wavelength (nm): 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625 Display Resolution: Linear Display: 0.1% Logarithmic Display: 0.01dBm Red Light Working Wavelength (nm): 650 Test Range (KM): Approx. 30000m / 98425.2ft Frequency Identification (Hz): 0, 270, 1000, 2000 RJ45 Line Finding Distance (m): Approx. 200m / 656.2ft Input Voltage (V): 3-6 Working Temperature (℃): -10 to +60 Storage Temperature (℃): -25 to +70 Automatic Shutdown Time (min): 10 Battery Continuous Working Time (h): Greater than or equal to 48 (measured by a single power meter) Battery (mAh): Rechargeable lithium battery 1100mAh x 1 [shipped with built in battery]