Outstanding - Zeiss Optics D12 Aspheric Hand Magnifier w/ Anti Reflective Hard Coating

The description of this item along with the rest of the line, could be better. The Diopter specification is more technical than magnifying power. Specifically it is 1/focal length in meters, for this lens, a bit over 3 inches an The image that it produces depends on two distances: object to lens and lens to eye. In general, this lens will provide 3X to 3.5X magnification. Higher magnifications result when the eye is about 10" from the lens. Holding that constant, magnification is based on the object to lens distance, but a particular distance will yield the best focus.
The bottom line is that the magnifier is comfortable to use, works far enough away from the object so as not to interfere with lighting and has a comfortable lens to eye distance.
Worth the money.