Exactly how Veho calculate the 20x and 400x magnifications rates is unclear. in 400x mode, most of the frame is the space between millimetre marks on a ruler. At 20x the frame captured by the VMS-004 covers a recorded distance from left to right of just over one centimetre. Magnification rates of 20x and 400x are claimed for the Veho VMS-004. For some reason I could only get the capture button on the unit itself to produce BMP format image files, while recording images from the supplied software produced JPEG files. Stills and video can be recorded from the VMS-004, though the CMOS origins of the sensor are betrayed by the rather wobbly nature of the moving image which limits the video capability somewhat. Software installation is straightforward, and there is a generous length of USB cable. It's a bit like using a torch that has a camera built in to the lamp. Instead, there are white LEDs surrounding the lens to illuminate the subject from above. There is no mirror or light source under the subject to illuminate the subject. There is no holder for glass slides, for example.
The first thing to realise is that digital microscopes like Veho VMS-004 are very different to conventional optical microscopes.
Ours is the Discovery Deluxe version, which comes with an adjustable desk stand. It sells for around £45 in the UK, or around $80 in the US. The model we've tested is the Veho VMS-004. The most widely advertised digital microscopes are branded Veho, a company that specialises in inexpensive digital imaging devices, like film scanners, and USB microscopes. So I find the idea of an affordable digital microscope quite appealing. I'm sure my experience was representative of many thousands of other kids. Although it was definitely a toy, designed and produced for young children, it was a real microscope, with three different objective lenses of varying magnification power, and it worked surprisingly well. I can remember very clearly when I received a toy microscope as a present when I was a child.
The Veho VMS-004 is rather like a close-focusing webcam
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