Ruby refers to corundum with red color. It is a kind of corundum. The main component is alumina (Al2O3), red is from chromium (Cr), mainly Cr2O3, the content is generally 0.1~3%, and the higher is 4%. Most of the natural rubies come from Asia (Myanmar, Thailand, Sri Lanka, China, Xinjiang, China, Yunnan, etc.), Africa, Oceania (Australia), and the Americas (Montana and South Carolina, USA). Natural rubies are very rare, so they are precious, but synthetic rubies are not too difficult, so industrial rubies are synthetic. In 1999, a red and sapphire continuum was found in Changle County, Shandong Province, China, weighing 67.5 carats. "鸳鸯 鸳鸯 "", can be called a rare miracle in the world. In 2012, a large number of ruby ​​mines were found in the Karakash River bed in Moyu County, Xinjiang, and 32.7 carats. People love rubies and regard it as a symbol of love, enthusiasm and morality, a symbol of glory. Legend has it that people wearing rubies will live long and healthy lives, love and family harmony. According to legend, the warriors of Burma used to cut a small mouth in their body and put a ruby ​​into the mouth. They thought that this could achieve the goal of invulnerability. The international gem world defines ruby ​​as "July Birthstone", which is a symbol of nobleness, love and love. Ruby red hot makes people always associate it with enthusiasm and love. It is known as the "stone of love", symbolizing the enthusiasm of fire, the beauty, eternal and firmness of love. Ruby is the birthstone of July. Rubies of different colors come from different countries, but they also mean auspiciousness. Red is always the messenger of beauty, and ruby ​​is a good guide to wish others to others. Ruby, good blessings, people are hard to give up that red, you also come to quickly collect a favorite you!
Multifunctional sports watch is a watch style specially worn in sports. Compared with ordinary watches, it has better waterproof, shockproof and drop-proof features, as well as practical functions such as air pressure prediction, altitude, heart rhythm, and compass. Therefore, it is deeply loved by the majority of friends who love sports.
Sports watches can be divided into three categories according to the types of their motion sensors: pedometer watches, GPS watches, and heart rate watches. Of course, there are many types of non-professional sports watches. Sports Watches,Sport Watches For Men,Sport Watches For Women,Sport Watches For Kids DIKA , https://www.dikawatch.com
Pedometer sportwatch
The motion sensor of the pedometer watch is a 3D acceleration sensor, which can sense the three-dimensional motion acceleration generated by human movement, such as walking and running, so as to record the number of steps per unit time. Calculate the speed and distance of the human body through the input step length, and calculate the calories burned through the input weight. Its advantage is that it can be used for outdoor and indoor sports, is not affected by the weather and is very power-saving, and can store several days of exercise data.
GPS sportwatch
The GPS watch calculates the distance moved per unit time by receiving the satellite position signal WAYPOINT, and calculates the moving speed. The accuracy of the position signal is determined by the strength of the satellite signal and the sampling rate. For example, the accuracy of a sampling rate of 1 second is obviously higher than that of a sampling rate of 60 seconds. However, a too high sampling rate will cause the battery to drain too quickly. Its advantage is that it can record the trajectory of the movement and synchronize it to the map.
Heart rate sportwatch
The heart rate watch uses the heartbeat current of the human body to measure the heart rate of the human body. The human body has different levels of heart rate at different exercise intensities. Internationally, the percentage of exercise heart rate to the maximum heart rate is divided into light activities: 50-60%, aerobic exercise 60-75%, endurance training 75-85%, intensity Training 85%-100%. Choosing different heart rate zones can achieve different training exercise effects.
Of course, the above three basic functions can also be combined with each other, such as heart rate pedometer, GPS heart rate monitor and other sports watch combinations.