Installation guide 1.Charging: plug the dedicated power charger to the power port. After the device is fully charged, the charger indicator lights will change from red to green. 2.Connection: select the number of connecting rods according to the height and rotate to connect the tester and connecting rods clockwise or dissemble counterclockwise 3. Disassembly and assembly of protection cover: rofate and remove protection cover counterclockwise and install the protection cover clockwise. 4.window with optical filter is the infrared light-emitting source. The window without an optical filter is the ultraviolet light-emitting source 5.The tester has a built-in flame burner that emits infrared wavelengths greater than 850 nanometers and ultraviolet wavelengths less than 280 nanometers through infrared filters and ultraviolet filters. The composite flame detector detects that the cover of the upper cover needs to be removed, and the output port can be aligned with the detector, and the distance is greater than 15 inside.