Fiber optic tester, optical power, fiber optic red laser indicator, rechargeable mini red laser indicator, three adjustable levels, fiber optic illumination pen

1. Short press to switch the red light gear. Divided into three levels, with weak, medium, and strong cycling switching in sequence, automatically saving the last gear used when shutting down. (5mw does not have this function) 2. Press and hold for 2 seconds to switch the 650 red light from constant mode to flashing mode in this gear; Press and hold for 2 seconds again to exit the flashing mode.