Labo-med leave both hands free for working - Lens Magnifier 7x 28D Working Distance app. 32 mm * Comfortable working distance even with a high level of magnification * Ideal not just for work tasks but also for leisure and craft activities * enses easily interchangeable. - Lens clamp made from glass fibre reinforced plastic * Lenses can used with Labo-Med 164450 - 164451 - 164452 - 164453 available on Amazon pictures 2-4.