YG-15/20/25 prepaid smart cold water meter adopts microprocessor to realize water collection, processing, ... 2007. Functions and Features: 1. IC card water meter use pre-paid way to achieve the new management ... mode of "purchase first, then use ".2. One meter with one card, it is good anti-tampering.3 ... automatically closed. 8. Adopting electric ball valve, the meter is good anti-jamming. 9. The data can ...