Lightweight, 1310/1550nm / 22/20dB / 0-60km OTDR, -70 ~ +10dbm or -50 ~ +26dbm optical power meter, >10mw visual fault locator, 1310/1550nm / >-5dBm optical light source, 0-60km measure distances, 9/125um Single-mode optical fiber, portable, big capacity battery, long work time, suitable for long time field working.