The method of metrological traceability of values for catalytic concentration of enzymes is now widely recognized as the combination of reference materials, reference measurement procedures and network of reference laboratories.

A temperature measuring and recording system with RFID for the quality tracing of agricultural produc was proposed and implemented in this paper.

Introduce portable ultrasonic flowmeter for liquid flow meter calibration online technical requirements measurement process and calculation method on emphases Analysis and validate the method with examples Concluded that the method could provision solution for liquid flowmeters online testing and offers a way to the liquid flowmeter online Traceability.

Based on the analysis of the particularity in the quantity traceability of natural flow rate,an introduction focuses on the key components of the quantity traceability of natural flow rate,especially on the working principle,the uncertainty range and the application of the MT,HPPP and PVTt methods about the primary standard equipment of natural gas flow rate.