QWORK Optical Power Meter, -70~+10 dBm Fiber Light Tester with 6 Calibration Wavelengths, Fiber Optical Cable Tester Checker Test Tool, with Universal 2.5mm Interface, Blue dingo If your device's headphone jack

If your device's headphone jack is an OMTP connection

small bookshelf box

With red and cyan filters

Cut-to-Fit (20-65mm)

Blue Sea Systems 1821 Temperature Sensor High Temperature boating electrical equipment

QWORK Optical Power Meter, -70~+10 dBm Fiber Light Tester with 6 Calibration Wavelengths, Fiber Optical Cable Tester Checker Test Tool, with Universal 2.5mm Interface, Blue dingo If your device's headphone jackQWORK Optical Power Meter, 70~+10 dBm Fiber Light Tester with 6 Calibration Wavelengths, Fiber Optical Cable Tester Checker Test Tool, with Universal 2. 5mm Interface, Blue Technical Specs Product Name Optical Power Meter Display Range 70~+10 dBm Resolution 0. 01dB Workign Wavelength 800 1700nm Working Temp 10 to + 50 Universal Interface Universal 2. 5mm interface, fit FC, SC and ST connectors Product Features Linear optical power and logarithmic