metal cds features is:
1. Vacuum packaging with metal and glass, . More stable
2. Encapsulated human eye
3. Response spectra peak similar
4. Quick respones
5. Resistance to high humidity, high pressure and high temperature

Major applications:
1. Boiler safety monitoring
2. Analytical Instruments
3. Surveillance equipment
4. Light-control equipment of various industries
5. Equipment used in harsh environment