A flow meter.
Point of use CHEAPER to use in most cases
meter
TDS meter
Yes you can use a flow meter to measure your water pressure. They are available at any home improvement retailer.
Housing and factories usually have a water meter that measures the amount of water used.
I don't know that there's any water activity meter that would necessarily be considered good for home use. They can range in cost upwards of $3000 and require proper care and calibration before use.
Yes Its Is, plus it could keep the plastic bottles out of the landfill.
A water meter is purchased at a plumbing wholesaler.
In the end, logically, water will be cheaper with water covering more than 90% of the earth's surface
cheaper in cold water as you don't have to heat up the water. but it is definitely not as effective
a meter that contains water