Multi-Functional Network Testing Compact Design: The Fiber Optic Tester YJ320 Mini Optical Power Meter For Fiber 2pcs/lot features a handheld and compact design. High Accuracy Measurements: With the ability to measure optical power with high precision, the YJ320 ensures reliable results for both absolute power measurements and relative loss measurements in fibers. Wide Measurement Range: This optical power meter boasts a wide measurement range from -70 to +6 dBm (YJ-320A) and -50 to +26 dBm (YJ-320C). Versatile Wavelength Capability: The Fiber Optic Tester YJ320 Mini Optical Power Meter supports a wavelength range from 800 to 1700 nm. User-Friendly Operation: Designed for ease of use, this optical power meter operates efficiently within temperatures ranging from -10 to +50°C., Manufacturer: MTHCKXJBSUZ