Advantech L3-S120 uses a measurement system for our wire cloth that's traceable to NIST standards and label each sieve for traceability. All Advantech Test Sieves are serialized to meet the highest grade quality assurance systems for traceability of measurement devices. The serial number is labeled on each sieve and allows for tracing vital information such as manufactured date, wire cloth lot number used to manufacture each sieve, shipping date along with purchase information. Each test sieve comes a CERTIFICATE OF COMPLIANCE applicable to ASTM E 11 specifications for wire cloth bearing the serial number of your sieve.