[RL-M5T-B11] RELIFE Trinocular 7-50X Continuous Zoom HD Optical Trinocular Microscope1. large size aluminum alloy base, give you a new visual enjoyment. 2. B11 large size aluminum alloy base, ensuring the working distance of 100mm, giving more operation possible. 3. Large caliber, wide field of vision, high definition wide Angle eyepiece, long term use is not easy to fatigue . 4. 0. 7 5. 0X Continuous variable zoom, accurate gear variable hand wheel, optical magnification 7 50 times, clearer imaging, accurate feedback, more accurate