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GESTER Instruments xrf handheld GESTER International Co.,Limited is the leading enterprise manufacturing high standard xrf handheld in the industry. With years of experience in manufacturing, we know clearly what the shortcoming and defects that the product may have, thus we carry out routine research with the help of advanced experts. These problems are solved after we carry out multiple times of tests. what are the five different types of textiles,aatcc 135 test method,textile testing laboratory.