product description The 30X professional magnifying glass is very suitable for jewelry stamps electronic circuit boards printing reading handicrafts watch repairs coins etc. The magnifying glass is made of solid zinc alloy material and has a black painted surface. It is very durable and not easily damaged. The lens uses optical glass to help you work professionally. We used advanced materials to make this high-quality magnifying glass. Under a magnifying glass of 30 times you can see very small text cracks on jewelry texture of stamps etc. Very useful in life.