Manual Fiber Amplifier Four Amplifiers built into Four-channel Fiber Amplifier Models. Four Fiber Units can be wired close together and connected to a Four-channel Fiber Amplifier without mutual interference. Compact with a width of 32 mm (Four-channel Fiber Amplifier Models) and a width of 10 mm (One-channel Fiber Amplifier Models). Built-in initial operating level compensation function allows no-object teaching.