PPR/AL/PPR pipe is a kind of composite pipe with outer and inside layer---polypropylene, middle layer---aluminum. With both advantages of ppr and aluminum. PPR/AL/PPR pipe can be darker than ppr pipes, can develop the features of polypropylene material---
Linshu Single phase RF Card Prepaid Electric Meter with integrated chip. It uses M1 card to manage electric information, RS 485 to realize meter correction, The meter has automatically correction function with software and overload protection function.
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