Carson eFlex MM-840 Digital Microscope — See Your Plants at the Cellular Level Spot pest infestations, flower development or root health before they become problems. The Carson eFlex connects directly to your computer via USB and displays a live magnified image on screen — no eyepiece squinting, no guesswork. Effective Magnification: 75x–300x (on 21" monitor) Max Picture Resolution: 1600 x 1200 Max Video Resolution: 640 x 480 Connection: USB 2.0/3.0 (no batteries required) Stand: Flexible neck with suction cup adapter + graduated base Compatibility: Windows 10/8/8.1/7/Vista/XP SP2+ and all Mac OS How to Calculate Your Magnification Multiply your monitor size (in inches) by 3.57–14.29. Example: a 32" monitor delivers 114–457x effective magnification. Capture still images or close-focus video with a single click. Attaches to any smooth surface via suction cup or sits on the included graduated base.