prepaid water meters

This water meter system is one card one meter only.Implement description. 1.the amount of cubic meter of water can be debited in the card by the software. 2.the meter reads the card and starts to work(if there is no balance the valve will close,when charge it the valve will open again). 3.when there is no balance,the valve in the meter will close.And the card should be debited again,and be read to the meter. For example,the software debite usd 100 into the card,when meter read the card,the meter will get usd100 one time ,or every certain amount (for example usd 20 per time) deducted. Water meter: we have multi jet water meter from 15mm(1/2) to 40mm(1 1/2),and woltman water meter from 50mm to 300mm; water meter for direct drinking of 8mm(3/8). Customized water meters for all of our water meter in website