Features 【Dual Backlit Modes for Convenience】 This visual fault locator features 2 backlit modes, including a smart mode that automatically turns off after 3 minutes of inactivity. The LED key allows easy switching between modes, ensuring visibility in various lighting conditions during fiber optic testing. 【Wavelength Memory Function】 Equipped with a wavelength memory function, this optical fiber power meter remembers the last test wavelength used, eliminating the need for repeated settings. This feature enhances efficiency and convenience for fiber optic engineers and technicians. 【Accurate Frequency Identification】 Capable of recognizing fiber transmission frequencies, this VFL helps determine lighting modes and continuous light emission during engineering construction. Its precision ensures performance in fiber optic network maintenance and troubleshooting. 【Intelligent Standby & Auto Shutdown】 Designed with an intelligent standby mode, this device automatically shuts down after 10 minutes of inactivity, conserving battery life. Its automatic shutdown function ensures energy efficiency and extends the 600mAh lithium battery lifespan. 【Multi-Unit Display & Universal Interface】 Supporting dBm, dB, and uW units, this fiber power meter provides versatile measurement options. Its FC, SC, and ST universal interfaces and detachable metal pen heads make it easy to use and maintain, ideal for fiber optic professionals.3 / 3 1. 2 BACKLIT MODES: Default smart mode when turned on, with no operations for 3 minutes to automatically turn off the backlit. In off mode, press the LED key to switch to intelligent mode. 2. WAVELENGTH MEMORY FUNCTION: Added memory function to remember the test wavelength set before shutdown. No need to repeat settings. 3. RECOGNIZABLE FIBER TRANSMISSION FREQUENCY: Accurately identify the fiber transmission frequency, which can be used to determine the lighting mode and whether it continuously emits light during engineering construction. 4. INTELLIGENT STANDBY MODE: The automatic shutdown function is enabled by default when turned on, and it will automatically shut down after 10 minutes without any operations. 5. 2 UNIT DISPLAY: Press the (UNIT) key to select dBm, dB, and uW units in sequence. The test data will be displayed with the corresponding results. 6. EASY TO USE: Fiber power meter supports FC, SC, ST common interfaces, detachable metal pen heads, easy to replace ceramic cores. Specification: Item Type: Visual Fault Locator Material: ABS Wavelength Range (nm): 800 to 1700 Probe Type: For InGaAs Measurement Range (dbm): -50 to +26 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 Output Distance (km): Approx. 15000m / 49212.6ft Frequency Identification (Hz): 0, 270, 1000, 2000 Number of Offline Saved Data (PCS): 40 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 Battery Type: 3.7V rechargeable lithium battery 600mah x 1 [shipped with built in battery] How Package List 1 x Optical Fiber Power Meter 1 x Data Cable 1 x Manual