Features The fiber optic power meter has 3 types of connectors and can measure 7 kinds of wavelengths. Resistant to impact and wear, very strong and durable. The measurement is of high accuracy and the response is fast. Can work normally at temperature -10~+60°C. Powered by 3pcs AA battery, each to replace battery. Function: 1. The fiber optic power meter has 3 types of connectors and can measure 7 kinds of wavelengths. 2. Resistant to impact and wear, very strong and durable. 3. The measurement is of high accuracy and the response is fast. 4. Can work normally at temperature -10~+60°C. 5. Powered by 3pcs AA battery, each to replace battery. Specification: Item Type:Fiber Optic Power Gauge< /a>Wavelength Range:800-1700 Connector Port: SC/FC/ST Probe Range: NoneAs Measuring range: -70~+3db Unsecurity: ±5% Linear Display: 0.1% Working temperature: -10~60°C Storage Temperature: -25~70°C Auto Shutdown Time: 10min Battery:3 x AA battery (not included) .we-text table td, .we-text table th,;.we-text table, Package List: 1 x Power Meter 1 x Connector Note: The LED screen is weak and the start side cannot be displayed. This may be because the battery is low, you can replace the battery in time. LED monitor information is not normal? It is possible that the plug is broken, dirty or locked. Reconnect the plug and clean the sensor How to reset factory settings? Press the "in" + "zero" button at the same time The calibration steps are as follows: 1. Press the "♚" + "LIGHT" button at the same time, "nm" at the end of the first row will not be displayed. 2. Every time the LIGHT button is pressed, the power value is increased by 0.05 dBm and the power value is adjusted to the default value by these two buttons. 3. Press the "zero" button to save 4. Restart the optical power meter or press "in" + "LIGHT" "Nm" at the end of the first row of the key is displayed and ready to use. Package List 1 x Power Meter 1 x Connector