Feature:1. The fiber optical power meter has 3 kinds of connector and can measuring 7 kinds of wavelength.2. to shock and wear,very strong and durable.3. The measuring is of high accuracy and the response is quick.4. Can working normally at temperature -10~+60℃.5. Powered by 3 pcs AA battery,each to switch battery.Spec:Item Type:Fiber Optical Power MeterWavelength Range: 800-1700Connection Port: SC/FC/STProbe Range: IngaAsMeasuring Range: -70~+3dbUncertainty: ±5%Linear Display: 0.1%Working Temperature: -10~60℃Storage Temperature: -25~70℃Automatic Shutdown Time: 10minBattery:3 x AA Battery(Not Included).w-e-text table td,.w-e-text table th,;.w-e-text table,Package List:1 x Power Meter1 x ConnectorNotice:The LED display is weak and the boot cannot be displayed.It may be because the battery is low, you can replace the battery in time.LED display data is not normal?It is possible that the connector is faulty, dirty or locked. Reconnect the connector and clean the sensorHow to restore the factory settings?Press the "in" + "zero" button at the same timeThe calibration steps are as follows:1. Press the "λ" + "LIGHT" button at the same time, the "nm" at the end of the first line is not displayed.2. Each time the LIGHT button is pressed, the power value is increased by 0.05dBm, and the power value is adjusted to the standard value by these two buttons.3. Press the "zero" button to save4. Restart the optical power meter or press the "in" + "LIGHT"The "nm" at the end of the first line of the key is displayed and ready for use.