Lens has received the best possible optical correction to make viewing free of distortion and colour blurring.
Recommended for critical inspection. Working distance 25mm, power 10X.
Though only a single lens magnifier, it's special construction, with a grooved diaphragm around its circumference, gives a good, distortion-free definition of the object being viewed.
Bausch & Lomb Watchmakers Eye Loupes have long been the industry standard. These are a lightweight magnifier manufactured for use with the available headband if desired