The 100 is unbeatable for reading small type and is ideal for students and teachers, hobbyists and naturalists, stamp and coin collectors, airplane pilots and anyone who wants to bring their world closer. It is also outstanding as a gift or premium and can be personalized with your name or logo. - The Original Magna-Lite features an optical quality approximate 5 power lens and conveniently placed on/off switch that can be locked in the on position for extended use. The model 100 is lightweight and has a durable impact resistant casing.