☆ Three ways to identify true and false profiles: 
1, spray code. Some of the profiles of real profiles will hit this corner, and the problem of falsification is because the cost is generally directly printed on the profiles. 
2, feel: really thick matte feeling, false texture will not be very good. 3. Price: Most of the shops in the residential area are enclosed with wholesale distributors. They are not counted in meters but in tons. Feng aluminum real cargo cost about 27,000 yuan a ton, fake is about 23,500 yuan, 63 square meters of my home closed balcony, the boss said less than a hundred pounds ~ cost we can calculate their own ~ ~ ~ but if the general district phoenix aluminum 888 1.4mm price of the profile is lower than 260 yuan / square meter, be careful ~. It is generally 270-275 yuan. Balcony doors and windows
narrow bandpass filters are characterized by high passband transmittance, accurate center wavelength, steep filter edges between pass- and blockband, and broadband blocking range.In manifold applications, the filters are used to select the appropriate part of the spectrum either from a light source or in front of a photodetector.Narrow bandpass filters for biomedical and industrial applications, with FWHM from 10nm to 60nm
Optical Bandpass Filters are used to selectively transmit a portion of the spectrum while rejecting all other wavelengths. Optical
Bandpass Filters are ideal for a variety of applications, such as fluorescence microscopy, spectroscopy, clinical chemistry, or imaging. These filters are typically used in the life science, industrial, or R&D industries.
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