DDZY217 (S18-1) Single Phase Multifunction Electronic Energy Meter is used not only for measuring the single phase a.c. active energy, but also for measuring the Maximum Demand, and it can be with Infrared port or RS485 for communication, and it is also with the function of multi-tariff and the anti-tamper, etc.. It adopts the high quality long lifetime components and SMT manufacturing craft, and is reliable in performance. It conforms to the standards of IEC 62053-21:2003, IEC62052-11:2003 and IEC62056.