IC card prepaid water meterIC card prepaid water meter is the new measuring instrument employing the microprocessor to realize water collection,processing ,display ,and reserving.It is the best choice ... application5.Low power consumption ,long life timeMAXIMUM PERMISSIBLE ERROR:a) In the lower zone , Q1≤Q≤Q2 is ±5%b ... ) In the upper zone ,when temperature≦30℃,Q2 ≤Q≤Q4 is ± ...