SincereetaliIt is used to detect optical fiber breakpoints and is used in the construction and maintenance of integrated wiring, optical component production and research and other optical fiber technologies. Features: Lightweight and portable for easy carrying and comfortable grip. Longer penetration distance, stable performance and long service time. 3 adjustable speeds, and there are power indicator lights, pay attention to the power at any time. With convenient LED light for operation in dark environment. 2.5mm universal pen heads, detachable, easy to replace the core. Features: Type: B3S05, B3S15, B3S20, B3S30 (optional) Output power: B3S05?: 5?mW B3S15?: 15?mW B3S20?: 20?mW B3S30?: 30?mW Working time: B3S05?: 10h B3S15?: 3.5?h B3S20?: 5h B3S30?:?5h Interface?: 2.5?mm Output wavelength: 650nm Battery: B3S05?:?2?AAA batteries, 1.5?V, 250?mAh B3S15?: 5?V, 900?mAh B3S20?: 5?V, 900?mAh B3S30?: 5?V, 900mAh Item Size: 125*35*17mm/4.9*1.4*0.7in Item Weight: 56?g / 2.0 ounces Package size: 150 * 60 * 30 mm / 5.9 * 2.4 * 1.2 inches Package weight: 83?g / 2.9 ounces Packing list: 1 * Optical fiber tester