Danger recognized, danger averted. The compact and strikingly red Voltcraft fiber optic tester, equipped with a rechargeable lithium-ion battery and automatic shut-off when not in use, allows for user-friendly visual fault detection. A fiber optic test can be conducted at distances of up to three kilometers, measured by a laser with continuous and blinking indicators. The LED light displays the laser status in three levels: on, blinking, or off. When the battery is running low, a four-level battery warning indicator shows when the tester needs to be recharged via USB cable. Additionally, the back of the fiber optic tester features a clip, allowing it to be quickly attached to a shirt or pants pocket at any time.