What are the popular science we need to know about watch（2）?

High-end watches usually use blued steel needles. There are many shapes of hands, but they have names and traditions, that is, the famous "Breguet" needle. The hands of sports watches are generally stick-shaped, and most of them are sword-shaped for flight or military use. Louis 15 and Louis 16 hands are basically used in clocks or pocket watches.

Waterproof function, a qualified watch must be sealed and can withstand 3 atmospheres of pressure.Waterproof watches will be marked on the case back: WATERRESISTANT. There is usually a waterproof level, and those under 10 atmospheres are considered waterproof for life. There are several ways to identify :(1) water depth, such as 30M, (2) pressure: written as 3ATM or 3BAR. Deep diving pressure-resistant watches can be seen up to 600 meters. Many watches are blindly marked with water resistance and cannot be trusted.

The so-called diving watch, as the name implies, refers to: a diving watch (a watch used by divers after waterproof and moisture-proof treatment. )General waterproof watches cannot be used for diving. Diving watches must meet strict regulations, and those with strong water resistance are not necessarily diving watches.To put it simply: diving watches should have higher waterproof performance, and have luminous hands and scales that are convenient for reading the moment in the dark seabed.The functions of diving watch are: 1. Corrosion-resistant flexible strap. 2. Snap-in anti-slip crown. 3 Helium escape. 4 Luminous indications. 5 Rotating bezel.

Watches with high anti-magnetic properties are very useful. Watches are susceptible to magnetism, causing them to suddenly walk a few minutes faster each day. Full demagnetization is done professionally. Anti-magnetic English logo: ANTI-MAGNETIC. Green glass Rolex, also known as "flash needle" anti-magnetic 1000 gauss, high anti-magnetic watch uses a software screen to wrap the movement. The latest technology is immune to magnetic technology, such as Omega's 15000+gauss

The watch case for deep diving is very thick, mostly titanium, and the glass is also very thick. The record-breaking watch was created by Rolex. After diving more than 10,000 meters, the watch glass is a hemisphere.