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Description: 0.5X magnification power suitable for the monocular 180X and 300X zoom lens we sell doubling total magnification power of your microscope and reduce the focus length objective magnification power by 0.7 - 4.5X(about 10 - 180X on the 21 inch display, using 0.5X Barlow Lens about 5 - 90X on the 21 inch display) package including: 1 x 0.5X Barlow lens recommend for you: if you want to get a less magnification, pls check below 0.3X Barlow lens https://www.amazon.com/dp/B07K6DLDGG if you want to get more magnification, pls check below 2X Barlow lens https://www.amazon.com/dp/B0711M8FK2