BENETECH GM65 Optic Power Meter Light Source Power Tester Features 1. 6 optic wave length for selection, including 850nm, 1300nm, 1310nm, 1490nm, 1550nm and 1625nm. 2. Universal optic interface design, FC converter for FCSCST interface. 3. Reading unit switching between absolute power and relative power. 4. Battery volume display, reminding you to replace batteries in time. 5. 10 minutes auto power off to save power. (This function can be set off.) 6. Light weight & mini size & low power consumption. 7. Widely applicable to optic fiber engineering, optic fiber sensor research, optic elements production, optic elements research, etc. Specification 1. Material: ABS 2. Power Supply: 2 x 1.5V AAA battery (Not included) 3. Measuring Range: -70~+6dBm 4. Wavelength: 850nm, 1300nm, 1310nm, 1490nm, 1550nm, 1625nm 5. Resolution: 0.05 6. Accuracy: Greater than or equal -48dBm, +-2dBm; Less than or equal -48dBm, +- 3.5dBm 7. Operation Environment(Greater than or equal -48dBm): 0~40 degree C (32~104 degree F), 5~95% 8. Operation Environment(Less than or equal -48dBm): 0~32 degree C(32~89.6 degree F), 5~80% 9. Storage Environment: 0~40 degree C(32~104 degree F), 5~95% 10. Auto-off: 10 minutes