This Professional LCD Viewfinder Loupe from XIT is designed for 3" screens on DSLR cameras. Suitable for most monitors with up to a 2.4 x 1.8" viewable area, it attaches to the screen via the included magnetic mounting plate, completely covering it, and offers 2x (200%) magnification. The loupe shields the LCD from unwanted light, allowing you to see clearly in bright sunlight. You can comfortably use either your right or left eye to look through it. The included lanyard attaches to the red ring on the loupe, and a carrying pouch is also supplied.
