Magnifying glass products have different uses: student teaching experiment, chemical industry; Electronics industry; Antiques; Daily book reading, etc., different magnification has different focal length.

1. Handheld: large lens, magnifying glass for reading books (one of them can be folded, handheld and desktop).

2. Handheld: small lens, high magnifying glass, usually observe calligraphy and painting, antiques, student botanical specimens, etc., the high magnifying glass in use should be close to the eye distance of about 1cm to observe the objects, and then the objects in the visual focal length range of observation.

3 portable: card magnifying glass is usually carried around, when needed to take out the use.

4. Mini microscope: TH-7004D is used by students in science and education to observe plant specimens, while 7004DB with clip can be used on the lens of mobile phone.

5. Insect magnifying glass: This is for your children to catch some insects and observe when they go close to nature on weekdays!