Media said improper use of masks

Recently, “Beijing plans to invest 760 billion yuan in air pollution control”, which has once again become a hot topic for discussion on topics such as air quality and respiratory protection. Accompanied by the hot issues of masks, such as "industrial .......

Simple respirator and respirator training

First, the simple production of gas masks

The simple gas mask is made of a transparent plastic bag as a mask cover, and a poison mask made of a filter canister is filled with a filter and a filter material. Its production steps are as follows: .......

Embedded Hard Disk Recorder: Features and Common Troubleshooting

Embedded hard disk recorder is a high-tech product combining computer technology, network technology, digital video technology, traditional video and security technology. It has high technical content and is a new generation of DVD and tape recorders. It can be used for remote monitoring of po.......

Instructions for use of the input level gauge

The advantages of the input type liquid level meter are: high measurement accuracy; easy installation; the signal can be remotely transmitted. The advantages of the remote-controlled liquid level meter are: high measurement accuracy; easy installation; the signal can be rem.......