If I press the edge of the microscope flat against a thin piece of paper, I can get only 85x magnification. That's on a 27 inch monitor. Why?

This is a confusing issue and the vendors aren't helping with their 2BazillionX magnification claims. In reality you are looking at focal lengths as far as "real" magnification goes and display size as far as "apparent" magnification goes. For real magnification what we are doing is focusing an image on a sensors surface. If we are closer to the subject we are going to cover more sensor surface with the image. This is measured in aspect ratio. If my focused image is the same size on the sensor surface as the subject itself the aspect is 1:1. If the image size is half the life size it's .5:1, etc. So with a 1:1 ratio a 1" subject would yield a 1" image on the sensor surface. 1:1 is usually considered nirvana for macro (super closeup) photography. You can "blow up" a 1:1 image a whole lot without it blurring. This is where the "monitor size" blather comes in. The more dots (pixels) the sensor had the more I can expand my display and still see good detail in the image. (Take a printed image and a decent magnifying glass and you will see the dots) If I expand my display size too much it will blur to the point it's useless to my eyes because my 'dots' are too far apart. The gist of this is that you change true magnification by moving the focus point (focal plane) closer or farther from the image sensor in the microscope. For the scopes smallest image size (lowest magnification) raise the scope body higher and use the focus/zoom wheel on the scope to focus the image. For the largest image size (magnification) you want to get as close to the subject as you can. Then the maximum "magnification" (display size) you use is simply determined by the number of pixels the sensor has. This scope has 5 million. That's a bunch! The photos you get will display well on a projector screen for an audience. As for true magnification this scope will focus down to the point the clear plastic hood touches the subject. This yields about 67X - which is really good for what you paid. Just a few years ago we would be discussing thousands of dollars (and Celestron products) to get clear images this size. I hope this info helps, it should be useful in understanding the measurement function of the software as well. The measurement function is really great for teaching purposes!

Hi. Is there anyone who want to make an experiment for me? Can you see any algae or any kind of life in a drop of water?

Depending upon the magnification, many "things" can be seen in a drop of pond water. http://www.microworldsphotography.com/Galleries/Microscopic-Creatures/i-cKDFwMC

Can the lighting intensity be varied?

Yes. There is a dial on the USB cord that allows you to adjust the intensity. The dial will allow you to turn the light completely off.

Can the magnification vary between 20X & 200X or is it just two fixed magnifications? For example can you magnify 50X or 80X?

The zoom is continuous, no fixed magnification levels between maximum and minimum.

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🔬 Unlock the unseen — elevate your curiosity to pro-level clarity!

HANDS FREE PRECISION - Professional adjustable height stand ensures steady, hands-free viewing for extended analysis sessions.
SEAMLESS CONNECTIVITY - 4-foot USB 2.0 cable offers flexible maneuverability across large surfaces without losing connection.
ZOOM INTO THE MICRO WORLD - Powerful 20x to 200x magnification with premium 5-element IR cut glass lens for vivid, sharp observation.
CROSS PLATFORM COMPATIBILITY - Intuitive software works flawlessly on both Windows and Mac, complete with built-in measuring tools.
CRYSTAL CLEAR DETAIL CAPTURE - True 5MP sensor delivers stunning, high-resolution images and videos to document every discovery.

The Celestron 5MP USB Handheld Digital Microscope Pro combines a high-resolution 5MP sensor with 20x–200x magnification and a premium 5-element IR cut glass lens. Designed for professionals and enthusiasts alike, it features an adjustable height stand for hands-free use, a 4-foot USB cable for flexible positioning, and intuitive software compatible with Windows and Mac. Perfect for education, forensics, circuitry, jewelry inspection, insect study, and textile analysis, this microscope transforms everyday observation into a detailed, immersive experience.