According to the degree of protection of the human body, bulletproof glass can be divided into two types, one is safety type and the other is life safety type. After being shot, the safety bulletproof glass has no splash on the non-elastic surface and does not cause any harm to the human body; after the gunshot of the life-safe bulletproof glass, there is spatter splash on the non-elastic surface, but the bullet cannot penetrate the glass. May cause secondary damage to the human body. Bulletproof glass has different requirements according to the anti-ballistic ability of different types of guns. Bulletproof glass is divided into three series, the first is aviation bulletproof glass, the second is bulletproof glass for vehicles and ships, and the third is bulletproof glass for banks. The thickness is between 18mm and 40mm. Bulletproof glass is a kind of high-safety special glass that can be kept in good or non-penetrating damage under the attack of some kind of bomb. Wireless level sensor is a high-precision, low-power wireless liquid level detection instrument, which consists of input liquid level sensor, signal processing circuit, communication module and power module. It uses a high-capacity, high-energy lithium battery, radio frequency radio transmission data. Installation is simple, easy to use, no need site wiring, leaves out the conventional instrument wiring bypass trouble, save manpower and construction cost, especially suitable for unwired and unpowered application site. Wireless Level Sensor,Wireless Water Level Indicator,Wireless Water Level Sensor,Wireless Fuel Level Sensor; wireless level transmitter Xi'an Gavin Electronic Technology Co., Ltd , http://www.cngamicos.com