1,3 IN 1 TOOL: This multifunctional device can be used as PON optical power meter, fiber port checker and red light test pen, used for various network testing and comm fields. 2,MULTIPLE FUNCTION: This handheld optical fiber tester can help check the performance of optical fiber cables, calculate relative power loss, locate faults, and troubleshoot them. 3,GOOD PERFORMANCE: This fiber optic tester has high measurement accuracy, optional switching display and automatic power off function, ensuring stable and reliable use. 4,SENSITIVE CHIP: This optical power meter adopts excellent chip, accurate and sensitive, the sturdy internal structure greatly extends its service life, with low battery consumption. 5,LCD SCREEN: This optical power meter adopts a color LCD display screen, clearly and intuitively displays test results and information, providing users with a better user experience. Item Type: PON Optical Power Meter Calibration Wavelength: 1310nm, 1490nm, 1550nm Detector: InGaAs Operating Temperature: -10-50℃ Storage Temperature: -20-70℃ Relative Humidity: 90% (and30℃) Connector: Removable FC PC, SC PC Power Supply: 2 x AA batteries (not included) 1 x Optical Power Meter 2 x Converter Heads 1 x User Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.