When inspecting laser fiber tips and input surfaces, 10X eye loupes don't magnify enough to reveal critical flaws that could result in damage to your laser or sub-optimal performance in surgery.
20X loupes are a far better choice, but even still, many cracks and chips will escape notice. InnovaQuartz recommends using a 30X loupe. Higher magnification would be better still...when we find a high quality 40X to 60X loupe we will make them available to you.
For now, this 30X loupe does an acceptable job.
P/N: 3-5030A (Single 30X Eye Loupe) -- $15.00 ea